Dive 549

UTC

Z(m)

Hdg

UTM X

UTM Y

Comments - Dive R549

Samples

Investigator

SubSmps

FrGrb#

Positions in utm x/y columns are automated and not flagged for accuracy. Consult dive maps for final position data.

Tasks: Worm grabs, suction samples, depl/rec bactrps Cloud, Mkr-33, Snail, Mkr-108. Video survey of Cloud.

Bottom Time: JD192(7/10) 0748-1639

06:21:29 Jul 10 '00

11

162

423395

5085573

ROPOS in water at 0619.

07:43:57 Jul 10 '00

1497

285

424154

5087568

Tunnicliffe tape has been on since 0632.

07:46:17 Jul 10 '00

1519

340

424169

5087562

We can see the bottom.

07:47:47 Jul 10 '00

1519

339

424169

5087562

Embley tapes on at 0740.

07:48:17 Jul 10 '00

1518

341

424169

5087562

Looks like the hose came off the arm for the suction sampler.

07:51:29 Jul 10 '00

1519

358

423924

5087051

Heading north to Snail Vent.

07:54:49 Jul 10 '00

1518

345

423930

5087064

Our fixes are way off to the east.

07:57:39 Jul 10 '00

1523

307

423889

5087096

We're at Cloud, but we want to be at Snail.

07:58:49 Jul 10 '00

1521

219

423886

5087057

Bottom at Cloud.

R549-001

07:59:49 Jul 10 '00

1521

274

423880

5087051

Cracks lined with white mat, putting the portabox down at Mkr-N8 at Snail Vent.

08:00:19 Jul 10 '00

1522

297

423880

5087051

Mkr-N8.

R549-002

08:01:49 Jul 10 '00

1523

184

423873

5087053

We're trying to re-grab the suction hose before heading over to Mkr-33

08:04:29 Jul 10 '00

1523

184

423872

5087057

We can't get the hose back in the five function.

08:05:59 Jul 10 '00

1523

187

423874

5087051

Using the seven function to put the hose in the five function.

08:08:59 Jul 10 '00

1523

186

423873

5087052

We aren't having much luck transferring the hose to the five function.

08:10:09 Jul 10 '00

1523

185

423873

5087058

We have the hose in the five function arm.

08:13:59 Jul 10 '00

1523

330

423873

5087048

Photo 107 of a really big fish at Snail.

08:13:59 Jul 10 '00

1523

330

423873

5087048

big fish. Snail

R549-003

08:14:19 Jul 10 '00

1522

339

423873

5087048

big fish. Snail

R549-004

08:15:29 Jul 10 '00

1523

14

423868

5087040

Big blue eyes fish.

R549-005

08:15:49 Jul 10 '00

1523

21

423849

5087149

Going to Mkr-33, 30m away.

08:17:51 Jul 10 '00

1521

295

423866

5087047

We can see Mkr-33.

08:19:41 Jul 10 '00

1520

216

423866

5087047

Photo 108 of Mkr-33.

08:19:51 Jul 10 '00

1521

244

423866

5087047

MTR and bacterial trap.

R549-006

08:20:21 Jul 10 '00

1523

211

423851

5087101

Bacterial trap in the fall.

R549-007

08:21:11 Jul 10 '00

1523

211

423851

5087101

Opening the port side of the biobox to take out two of the bactraps.

08:23:49 Jul 10 '00

1517

358

423920

5087045

bottom

R549-008

08:24:31 Jul 10 '00

1523

251

423843

5087052

Trying to get trap out of port side of biobox.

08:26:41 Jul 10 '00

1523

252

423843

5087054

DEPLOYING BACTERIAL TRAP #52.

08:29:01 Jul 10 '00

1523

214

423842

5087056

Placed bacterial trap #52

08:29:01 Jul 10 '00

1523

214

423842

5087056

Bactrap #52 deployed.

R549-009

08:30:21 Jul 10 '00

1523

219

423851

5087101

Removing another bacterial trap from the port side of the biobox.

08:32:01 Jul 10 '00

1523

220

423843

5087056

DEPLOYING BACTERIAL TRAP #51 AT Mkr-33.

08:33:21 Jul 10 '00

1523

220

423842

5087049

RETRIEVING BACTERIAL TRAP from Mkr-33.

08:35:01 Jul 10 '00

1523

217

423842

5087049

Little tubeworms under the crack behind the bac traps at Mkr-33.

R549-010

08:37:11 Jul 10 '00

1523

217

423829

5087111

Bacterial Trap #44 from Mkr-33 into port side of biobox z=1520. Mkr-33 x=423950, y=5087101.

R549-BT-0001

Moyer

08:37:41 Jul 10 '00

1523

219

423842

5087053

Bactrp #44 into port biobox.

R549-011

08:41:51 Jul 10 '00

1523

214

423841

5087054

RETRIEVING BACTERIAL TRAP #46.

08:42:51 Jul 10 '00

1523

214

423841

5087054

Bacterial trap #46 into port side of biobox. Mkr-33 x-423950, y=5087101.

R549-BT-0002

Moyer

08:48:23 Jul 10 '00

1523

218

423842

5087055

Going to Cloud now.

08:48:43 Jul 10 '00

1523

218

423842

5087047

Photo 109 of traps at Mkr-33.

08:48:43 Jul 10 '00

1523

218

423842

5087047

Bac traps 51 and 52 deployed at Mkr-33.

R549-012

08:52:03 Jul 10 '00

1522

338

423874

5087036

We're at Snail but we want to be at Cloud.

08:52:13 Jul 10 '00

1522

346

423870

5087034

Huge rattail between Mkr-33 and Cloud.

R549-013

08:59:13 Jul 10 '00

1521

2

423887

5087055

Going back to the cage because we can't find Cloud and we want a good fix.

09:06:13 Jul 10 '00

1518

108

423905

5087062

We're still looking for Cloud.

09:11:03 Jul 10 '00

1519

237

423912

5087037

Towers on the way for Cloud.

R549-014

09:11:33 Jul 10 '00

1519

260

423912

5087037

Shutting the cage motor off!!!!

09:17:35 Jul 10 '00

1518

255

423926

5087050

We are still looking for Cloud.

09:21:15 Jul 10 '00

1519

238

423882

5087060

Going back to the cage again - still trying to get to Cloud.

09:24:05 Jul 10 '00

1505

10

423873

5087032

Dropping down from the cage again and going 020 to look for Cloud

09:25:05 Jul 10 '00

1521

21

423886

5087029

Passage on the road to Cloud.

R549-015

09:28:05 Jul 10 '00

1517

276

423904

5087046

Lateralling from the south looking west for Cloud.

09:29:35 Jul 10 '00

1515

92

423903

5087012

We're going back to Mkr-33 to start again to look for Cloud.

09:33:25 Jul 10 '00

1516

252

423863

5087034

Shutting off the cage motor again to figure out where we are.

09:34:15 Jul 10 '00

1512

224

423863

5086997

We are way south - oops.

09:35:35 Jul 10 '00

1519

15

423863

5087049

Oops- we just ran into a lava pillar. We're a bit frustrated.

09:36:25 Jul 10 '00

1521

15

423863

5087049

Totem on the road to Cloud.

R549-016

09:38:25 Jul 10 '00

1517

17

423893

5087100

Turning the cage motor off again.

09:41:57 Jul 10 '00

1518

276

423893

5087142

Shutting the cage motor down again.

09:43:57 Jul 10 '00

1516

278

423923

5087077

The compass on the sub was offset by 40 degrees - that's why we've been getting lost. we have corrected that so we are now trying north.

09:47:57 Jul 10 '00

1519

3

423900

5087108

OH MY GOD we see a Marker- we really think it is Cloud!

09:50:57 Jul 10 '00

1523

290

423901

5087104

We see Mkr-21. -We are now going to Mkr-N4 at Cloud to do bacterial trap stuff.

09:52:57 Jul 10 '00

1525

258

423890

5087061

Embley tapes changed at 0945.

09:59:47 Jul 10 '00

1524

281

423888

5087067

We're still looking for Mkr-N4.

10:06:47 Jul 10 '00

1523

258

423877

5086826

Still trying for Mkr-N4.

10:08:21 Jul 10 '00

1523

271

423886

5087075

We think we see Mkr-N4.

10:09:33 Jul 10 '00

1522

104

423879

5087075

Tubeworms at Mkr-N4.

R549-017

10:10:57 Jul 10 '00

1522

104

423880

5087073

We definitely see Mkr-N4 Cloud - now we need to get in position for getting the traps.

10:14:21 Jul 10 '00

1523

99

423880

5087078

RETRIEVING BACTERIAL TRAPS AT CLOUD Mkr-N4.

10:14:57 Jul 10 '00

1523

97

423882

5087073

Bacterial trap #48 into port side of biobox from Cloud Mkr-N4. z=1523. x=423896, y=5087119

R549-BT-003

Moyer

10:14:57 Jul 10 '00

1523

97

423882

5087073

Bactraps #47 and #48 at Cloud.

R549-018

10:15:45 Jul 10 '00

1523

97

423880

5087071

Bacterial trap #47 into port side of biobox from Cloud Mkr-N4. x=423896, y=5087119.

R549-BT-004

Moyer

10:19:33 Jul 10 '00

1523

97

423881

5087074

We are done retrieving bacterial traps.

10:23:45 Jul 10 '00

1522

135

423893

5087104

We are now DEPLOYING bacterial traps #53 and #54 at Mkr-N4.

10:24:21 Jul 10 '00

1522

122

423880

5087073

Deploying bactraps #53 and 54 at Mkr-N4.

R549-019

10:28:23 Jul 10 '00

1523

72

423894

5087103

Final position for bactraps #53 and 54 at Mkr-N4

R549-020

10:28:35 Jul 10 '00

1523

72

423888

5087113

We are done deploying bacterial traps 53 and 54 at Mkr-N4.

10:31:11 Jul 10 '00

1523

71

423881

5087074

We're going to Mkr-N6.

10:32:33 Jul 10 '00

1522

71

423881

5087072

We are readjusting bacterial trap #54

10:35:35 Jul 10 '00

1522

71

423880

5087075

We're done adjusting the bacterial traps at Mkr-N4 and are now going to Mkr-N6 for worm suction and video.

10:35:35 Jul 10 '00

1522

71

423880

5087075

Modification after final position of bactraps.

R549-021

10:37:47 Jul 10 '00

1524

310

423901

5087098

We are moving Mkr-21 back to the big hole because it was moved earlier and is annoying us

10:38:23 Jul 10 '00

1524

321

423896

5087107

Tunnicliffe tape on

10:42:11 Jul 10 '00

1524

354

423887

5087070

We are preparing to grab tubeworms at Mkr-21.

10:43:23 Jul 10 '00

1524

355

423899

5087113

"If I didn't have my shoes all laced up I would take one off and beat you!" - Kim j to Anna m.

10:45:11 Jul 10 '00

1524

357

423865

5087128

Tube Worm grab at Cloud Mkr-21 into starboard side of biobox. X=423904, y=5087110.

R549-TWG-0005

Marcus

10:48:35 Jul 10 '00

1524

359

423900

5087101

Grab at Mkr-N4 for Jean.

R549-022

10:51:23 Jul 10 '00

1525

2

423874

5086828

Still grabbing worms.

10:53:23 Jul 10 '00

1525

2

423880

5087065

This is some serious floc action going on here.

10:54:59 Jul 10 '00

1525

14

423886

5087077

There are tubeworms and ropes hanging out of the biobox which will disturb Kim's ability to do a video survey.

11:00:23 Jul 10 '00

1524

332

423874

5087153

Suction Sample (FLUID) Jar #4. Start suction 11:00 for Butterfield water sample. End suction at 11:05. Cloud Mkr-21 x=423904, y=5087110

R549-SS-J4-0006

Butterfield

11:09:23 Jul 10 '00

1525

334

423875

5086822

Suction Sample, Jar #3. Start suction at 11:10 for Craig water plus bacterial mat (FLUID and MAT). End suction at 11:16. z=1524. Cloud Mkr-21 x=423904, y=5087110.

R549-SS-J3-0007

Moyer

11:19:11 Jul 10 '00

1524

354

423887

5087069

Start suction (BIO) for Juniper at 11:17 for little animals. End suction at 11:21. Cloud Mkr-21 x=423904, y=5087110.

R549-SS-J1-0008

Juniper

Marcus

11:24:59 Jul 10 '00

1524

4

423888

5087074

Start suction (BIO) for Tunnicliffe at 11:25 for semi-peripheral fauna. End suction at 11:32. This site had a high abundance of scale worms. Cloud Mkr-21 x=423904, y=5087110.

R549-SS-J2-0009

Marcus/ Tunnicliffe

11:31:23 Jul 10 '00

1524

5

423887

5087074

Video of TW slurp at Cloud.

R549-023

11:35:35 Jul 10 '00

1524

5

423888

5087072

Photo #110 taken of tubeworms and venting field.

11:41:35 Jul 10 '00

1524

295

423668

5086825

Looking at Mkr-21.

11:43:59 Jul 10 '00

1524

296

423892

5087070

Start of McLane pump at 11:44 for (WATER) sample during video survey. Pump was turned off at 12:48. Cloud Mkr-21 x=423904, y=5087110

R549-McLane-0010

Metaxas

11:45:47 Jul 10 '00

1522

293

423903

5087100

Video mapping commenced for Juniper and the Tunnicliffe tape has been turned off.

11:48:23 Jul 10 '00

1522

291

423888

5087113

Redoing one line of transect to the east. Going to move the ship 50m south of cloud.

11:51:11 Jul 10 '00

1524

345

423904

5087096

Moving ROPOS back to original starting point of video taping while the ship moves. Video will traverse east to west.

11:55:23 Jul 10 '00

1523

289

423890

5087072

Have commenced video survey again.

12:12:35 Jul 10 '00

1524

286

423891

5087071

4th line of survey commenced on 285 heading.

12:37:23 Jul 10 '00

1520

288

423880

5087062

Still performing Juniper's video survey.

12:49:35 Jul 10 '00

1523

293

423881

5087041

Stopping the Beta Cam.

12:54:11 Jul 10 '00

1523

300

423875

5087111

Fish blocked in the aspirator?

R549-024

12:56:47 Jul 10 '00

1523

300

423884

5087065

Attempting to suck up fish, but there are rocks blocking the line.

12:58:35 Jul 10 '00

1523

298

423883

5087059

The fish after time in the aspirator.

R549-025

12:58:59 Jul 10 '00

1523

301

423883

5087059

Suction of a vent fish (BIO) off the sea floor. Can't unclog the line so will attempt to leave it in the line. At 13:24 line was unclogged and fish put into jar #8. Cloud Mkr-N4 x=423896, y=5087119

R549-FISH-0011

Juniper

Tunnicliffe

13:02:47 Jul 10 '00

1524

14

423887

5087055

Beta cam has been turned on.

13:02:59 Jul 10 '00

1524

14

423900

5087109

Mkr-21

R549-026

13:03:35 Jul 10 '00

1524

14

423898

5087107

Tubeworms near Mkr- 21.

R549-027

13:05:11 Jul 10 '00

1524

357

423888

5087066

Mkr-N21

R549-029

13:11:59 Jul 10 '00

1524

19

423895

5087107

The Mkr-21

R549-029

13:12:47 Jul 10 '00

1524

19

423670

5086821

approach of Mkr-21

R549-031

13:19:35 Jul 10 '00

1524

346

423878

5087136

Beta cam has been turned off.

13:20:23 Jul 10 '00

1525

353

423878

5087120

Tubeworms and so much blue near Mkr-N21.

R549-031

13:22:47 Jul 10 '00

1525

323

423876

5087155

The fish is finally inside the flush bottle.

R549-032

13:25:35 Jul 10 '00

1525

324

423898

5087111

Environment of the Mkr- N21.

R549-033

13:26:47 Jul 10 '00

1525

324

423880

5087118

Beta cam has been turned back on for last "fly across the field" for Juniper's video survey.

13:29:23 Jul 10 '00

1523

288

423898

5087114

Beta cam has been turned off as well as the Juniper tape, which signals the end of the video survey by Juniper.

13:32:47 Jul 10 '00

1486

125

423891

5087052

Video has been turned off for transit to Snail.

13:36:47 Jul 10 '00

1517

222

423885

5087053

Now at snail.

13:42:35 Jul 10 '00

1521

219

423635

5086917

Crack near empty biobox at Snail

R549-034

13:46:47 Jul 10 '00

1524

183

423873

5087053

Photo taken of Snail area.

13:48:11 Jul 10 '00

1524

30

423880

5087093

Good fix X=423880 Y=5087093

13:58:47 Jul 10 '00

1524

75

423840

5087178

Picked up rock samples coated with organisms for Tunnicliffe. (BIO and RK). Near Snail - Mkr-N8 x=423877, y=5087088

R549-RK(TWG)-0012

Tunnicliffe/ Marcus

J Chadwick

14:12:35 Jul 10 '00

1523

173

423869

5087051

Two photos taken of iron oxides. x=423882 y=5087073 at 14:15 was a good fix for location of photos.

14:18:35 Jul 10 '00

1524

113

423630

5086900

Suction sample of FeO. Start of suction at 14:20, end suction at 14:26. (subsample basalt RK). Near Snail - Mkr-N8 x=423877, y=5087088.

R549-SS-J2-0013

Kennedy

J Chadwick

14:28:59 Jul 10 '00

1524

46

423860

5087074

Transiting to Mkr-108 along the ground, 490 meters away.

14:30:47 Jul 10 '00

1524

191

423856

5087067

2 photos taken

14:32:11 Jul 10 '00

1521

198

423880

5087023

Photo taken

14:34:23 Jul 10 '00

1522

194

423885

5086962

Photo

14:35:59 Jul 10 '00

1525

191

423886

5086956

Photo

14:38:11 Jul 10 '00

1523

188

423897

5086954

Photo

14:41:11 Jul 10 '00

1524

193

423898

5086936

2 photos

14:42:11 Jul 10 '00

1524

192

423897

5086926

Photo

14:43:11 Jul 10 '00

1524

190

423889

5086906

Photo

14:43:35 Jul 10 '00

1523

190

423889

5086906

Photo

14:43:35 Jul 10 '00

1523

190

423889

5086906

Photo

14:44:23 Jul 10 '00

1522

188

423887

5086901

2 photos taken

14:46:11 Jul 10 '00

1521

192

423887

5086876

2 photos

14:48:47 Jul 10 '00

1522

189

423886

5086871

3 photos taken

14:50:23 Jul 10 '00

1522

188

423882

5086851

2 photos taken

14:53:23 Jul 10 '00

1522

192

423872

5086791

3 photos taken of more recreational geology.

14:55:11 Jul 10 '00

1522

194

423860

5086765

Another 3 photo's taken by crazy Camera girl Jean Marcus.

14:56:11 Jul 10 '00

1523

190

423867

5086740

Jean took yet another photo.

14:57:11 Jul 10 '00

1521

212

423857

5086713

5 photos taken of lava pillars.

14:57:59 Jul 10 '00

1519

213

423861

5086699

Photo taken of another pillar.

14:59:59 Jul 10 '00

1524

222

423841

5086655

2 more photos taken.

15:00:35 Jul 10 '00

1521

223

423832

5086646

Photo taken.

15:01:11 Jul 10 '00

1522

221

423832

5086646

Photo taken.

15:01:47 Jul 10 '00

1523

222

423839

5086628

Photo taken.

15:01:59 Jul 10 '00

1523

219

423839

5086628

Photo taken.

15:02:23 Jul 10 '00

1524

221

423820

5086621

2 Photos taken.

15:02:35 Jul 10 '00

1525

221

423818

5086616

Geology

R549-035

15:03:23 Jul 10 '00

1525

231

423826

5086607

Photo taken.

15:03:35 Jul 10 '00

1525

231

423826

5086607

3 photos taken.

15:03:47 Jul 10 '00

1523

230

423820

5086607

Geology

R549-036

15:04:23 Jul 10 '00

1521

230

423820

5086604

Pillar

R549-037

15:04:59 Jul 10 '00

1521

232

423815

5086600

Photo taken.

15:05:35 Jul 10 '00

1522

231

423815

5086595

Photo.

15:06:23 Jul 10 '00

1520

292

423794

5086588

8 photos taken of pillars

R549-038

15:07:11 Jul 10 '00

1521

299

423444

5087244

5 photos taken.

15:07:35 Jul 10 '00

1521

271

423797

5086589

On the way to Mkr-108

R549-039

15:08:23 Jul 10 '00

1521

268

423494

5086501

Photo taken.

15:08:35 Jul 10 '00

1521

350

423797

5086593

Photo

15:09:59 Jul 10 '00

1522

268

423768

5086611

15:05 Tunnicliffe tapes changed.

15:10:35 Jul 10 '00

1525

263

423763

5086595

Photo

15:12:11 Jul 10 '00

1525

86

423792

5086558

Photo.

15:16:35 Jul 10 '00

1521

202

423843

5086312

Scanning the pillars for Mkr-108. Can't find it. We found an Alvin weight at the bottom of a pillar. Lots of white floc in the water. 3 photos taken.

15:16:47 Jul 10 '00

1521

185

423843

5086312

Spider crab on pillar around Mkr-108.

R549-040

15:20:23 Jul 10 '00

1521

112

423787

5086593

Four transponder fixes put us right on top of the target.. We think the marker may be gone.

15:21:35 Jul 10 '00

1521

351

424608

5088213

Photo.

15:23:47 Jul 10 '00

1521

36

423846

5086616

Site at Mkr-108

R549-041

15:26:23 Jul 10 '00

1521

201

423790

5086566

Photo taken.

15:31:23 Jul 10 '00

1524

154

423782

5086593

Location of Jean's suction sample at Mkr-108.

R549-042

15:31:47 Jul 10 '00

1524

153

424452

5088069

Focusing in on white microbial mats and blue protozoan mats. Looking for fauna to suction. Photo taken.

15:32:23 Jul 10 '00

1524

154

423776

5086584

Jean's suction sample, Mkr-108.

R549-043

15:35:11 Jul 10 '00

1524

167

423791

5086587

Position for Mkr-108, even though we can't find it. x=423784 y=5086589 z=1524.

15:37:35 Jul 10 '00

1524

166

423818

5086539

Suction sample of BIO (limpets, worms). Started suctioning: 15:36 Ended suctioning: 15:42. (subsample basalt chips RK). Mkr-108 x=423784 y=5086589

R549-SS-J5-0014

Marcus

J Chadwick

15:38:35 Jul 10 '00

1524

163

423795

5086568

Jean's suction sampling at 108

R549-044

15:42:35 Jul 10 '00

1524

165

423810

5086545

Suction sample: BIO. Started: 15:48 Ended: 15:51. Mkr-108 x=423784 y=5086589

R549-SS-J1-0015

Juniper

15:43:59 Jul 10 '00

1524

181

423514

5086895

Photo taken.

15:54:11 Jul 10 '00

1524

246

424456

5087955

Pretty rock at Mkr-108

R549-045

15:54:23 Jul 10 '00

1524

247

424456

5087955

ROCK with a blue mat on it. Some limpets and worms (BIO) are on it too. Will carry up in arm. Mkr-108 x=423784 y=5086589

R549-RK-0016

Tunnicliffe/ J Chadwick

16:00:47 Jul 10 '00

1524

260

423752

5086594

Sampling a rock with blue mat.

R549-046

16:00:59 Jul 10 '00

1524

258

423780

5086594

Photo taken while sampling rock with blue mat on it.

16:09:23 Jul 10 '00

1524

289

423267

5086339

Rock sample.

R549-047

16:16:23 Jul 10 '00

1522

83

423773

5086574

Picked up portabox and headed somewhere else to rearrange things.

16:19:59 Jul 10 '00

1523

167

423758

5086631

All tapes off at 16:08

16:21:35 Jul 10 '00

1523

164

423763

5086600

Photo taken.

16:36:59 Jul 10 '00

1486

290

423762

5086582

ROPOS parked in the cage.

16:40:11 Jul 10 '00

1382

224

423770

5086584

Coming up.

16:41:23 Jul 10 '00

1339

241

423770

5086587

Moving the ship 200m south of the camera recovery mooring. (Camera mooring near Mkr-N41, NE of Nascent.

17:21:29 Jul 10 '00

1

207

423790

5086606

McLane pump. Volume=330 liters. Pumped fluid during video survey at Cloud Vent.

R549-McLane-0017

Metaxas

Recovered NeMO Net'99 camera after this dive. Mkr-N41, NE of Nascent.

R549-TLC-0018

Tunnicliffe

R549 Dive Summary: Mkr-33-Deployed 2 bactrps. Recovered 2 bactrps. Cloud-Deployed 2 bactrps, Recovered 2 bactrps, video traverse. Samples: 1 fish, 1 twg, 4 ss, 1 McLane. Snail-Samples 1 twg, 1 ss. Mkr-108-Samples: 2 ss, 1 rk. Recovered NemoNet'99 camera after dive from Nascent Vent.

1428-1516 transit on bottom from Snail to Mkr-108. (great geology)