Dive R499  
      Dive Plan: Fluid sample northern new lava area at Magnesia, N41, Oxide (near N41), Nascent, Cloud, Mkr-33. Suction sample at Magnesia, OldWorms and Mkr-33. Imagenex. Deploy Osmo at Magnesia  
      Note: Nav fixes not edited in the logs. All fixes were logged, regardless of accuracy. Use the dive plots to determine actual positions.  
  UTC Hour Min Depth (m) Sub Hdng (deg) UTM X UTM Y Comments Frmgrbs, Photos, Samples
3 59 0 0 420874 5096849 ROPOS in the water at 15:09 UTC  
16 27 1526 87 421434 5084283 On the bottom. Lava pillar. Resetting still camera count to zero.  
16 30 1523 87 423372 5088972 Just hanging out for a few minutes while we wait for nav.  
16 30 1523 87 423372 5088972 Lots of floc in the water - did ROPOS stir some up or is it snow output from Magnesia vent? Still waiting for nav, disregard fixes.  
16 30 1523 87 423372 5088972 White spire in the distance - looks like it is hydrothermal in origin. Multiple pillars. We are not at Magnesia yet, we're waiting for a good fix. Looks like there might be some white spots, some venting. Photo 1 - 4
16 40 1527 85 423306 5088132 More pillars, covered on top with sediment. Is it hydrothermal in origin? Photo 5
16 43 1525 91 423674 5088571 good ROPOS fix.  
16 44 1526 179 423819 5088308 More pillars. Not getting video input to the frame grabber. Lots of floc in the water and fall out on the ground. Photo 7 - 8
16 46 1528 187 423897 5088183 At Magnesia vent. Tons of floc coming out of the pit.  
16 46 1530 162 423678 5088534 Frame grab video back on. Still no good nav.  
16 48 1530 164 423676 5088138 Video highlights on. Moving into position to fluid sample.  
16 49 1528 120 423670 5088545 good ROPOS fix: 3669, 8545. Accidental photo. Photo 8
16 59 1531 353 423669 5088550 Probing for temperature at Magnesia. Note: Imagenex is not getting data. Maximum temp. at 7 degrees C.  
17 7 1531 357 423674 5088535 Locked the arm for fluid sampling - up to 7.3 degrees C. Starting to suction at 17:08 into filter #3 for xrf of HFS. HFS-3_dfl

_R499-1
17 13 1531 359 423666 5088550 Finished pumping R49-1 at 17:13, 50 ml was pumped. Starting to pump into piston #4. Stopping at 17:19, 60 ml pumped. HFS-4_dfl

_R499-2
17 19 1531 359 423670 5088548 The max. temp on the last sample (R49-2) was 7.4 degrees C. Starting to pump gas piston #5. Stopped at 17:22. HFS-5_dfl

_R499-3
17 23 1531 357 423670 5088537 Starting to pump bag #18 of HFS at 17:26. This is the last fluid sample at Magnesia. Stopped pumping at 17:31, pumped 613 ml. Few seconds of highlights at 17:32. HFS-18_dfl

_R499-4
17 40 1531 357 423678 5088536 Spent the last 5 minutes panning around looking for animals to suction. We could only find a couple scale worms. We are going to deploy the Osmo first and then go for a suction sample.  
17 45 1531 5 423669 5088545 Deploying the Osmo sampler.  
17 52 1531 18 423668 5088544 Shut off the sub aux. power to try and get imagenex working. It's working now.  
17 54 1530 17 423667 5088547 Still trying to deploy the Osmo. Grabbing the t-handle and placing the intake down into the pit opening.  
18 1 1531 22 423668 5088545 Dropping the Osmo intake into the pit.  
18 12 1531 335 423665 5088552 The intake tip is in place for the Osmo, now need to position the main body.  
18 14 1531 335 423675 5088528 Still at Magnesia. Tripping the Niskin bottle at 18:17. Niskin_dfl

_R499-5
18 22 1530 5 423668 5088546 Osmo sampler Red at Magnesia R499-1
18 22 1530 26 423669 5088545 Photo of Osmo position. Photo 9
18 25 1530 216 423668 5088554 Red Osmo sampler at Magnesia R499-2
18 24 1528 179 423669 5088548 VHS tapes changed. Still at Magnesia. Photo 10
18 30 1531 24 423194 5088810 Area shot R499-3
18 30 1531 14 423194 5088810 Venting fluid at Magnesia R499-4
18 33 1531 350 423669 5088549   R499-5
18 33 1531 348 423669 5088549 Red Osmo sampler at Magnesia R499-6
18 34 1531 346 423669 5088554 Red osmo sampler at Magnesia R499-7
18 36 1531 354 423675 5088523 Repositioning for suction sampling of scale worms.  
18 39 1532 43 423669 5088544 Highlights have been off for awhile.  
18 41 1527 325 423658 5088538 Susan-san says a good fix.  
18 49 1529 210 423657 5088548 Still trying to find some polynoids to suction for Jean.  
18 55 1497 286 423661 5088551 Suction sampling abandoned as visibility was poor.  
18 58 1498 42 423661 5088551 Back to cage. Power problems with sub but not lethal.  
19 14 1501 152 423680 5088495 On our way to Old Worms. ROPOS at cage as ship moved.  
19 17 1503 124 423694 5088492 We were in a dense plume. Took highlight video. Now getting out of plume - going from snow to fog"."  
19 27 1504 360 423788 5088439 smoke plume R499-8
19 27 1504 46 423777 5088438 Still in fog" = buoyant plume of fine particulates near Old Worms."  
19 29 1521 212 423791 5088447 On the bottom in worms so must be at Old Worms site.  
19 30 1524 188 423807 5088481 water and worms R499-9
19 30 1525 187 423791 5088448   R499-10
19 30 1524 186 423791 5088448 Photos of sponges on a pillar. Photos 1 & 12
19 31 1523 148 423796 5088439 Photo of drainout and tube worms. Photo 13
19 33 1524 174 423794 5088432 Photo of lobate lava, worms and crab.  
19 33 1523 151 423796 5088428 Last was photo 14 - forgot to enter to right. Photo 14
19 36 1525 188 423798 5088428 Worms are (barely) alive. Not much venting seen yet.  
19 38 1524 261 423799 5088422 Worms, crab (maybe). Photo 15
19 39 1524 266 423792 5088422 More worms. Photo 16
19 39 1525 234 423792 5088424 Appear to at place where we sampled on an earlier dive.  
19 40 1524 313 423780 5088421 Diffuse vent, sponges. Photo 17
19 45 1526 88 423782 5088427 Parked in front of a tube worm bush looking for fluid to sample.  
19 55 1526 110 423780 5088430 Stuck HFS into tube worm bush. Found only 4.2C and no obvious flow so not a suitable sampling site.  
20 2 1526 115 423784 5088418 suspected venting R499-11
20 7 1525 175 423785 5088418 yet another spot to check out R499-12
20 4 1526 116 423783 5088421 Lazy flow in tube worm bush. Not good enough to sample.  
20 8 1525 168 423786 5088417 Moved west and found a better site with lush growth and good fluid flow.  
20 19 1526 148 423787 5088412 Gas piston #24 started at 20:19:40. good fix. HFS-24_dfl

_R499-6
20 21 1526 147 423786 5088412 Gas sample stopped after 1 minute at 20:21. Probably ~150 ml.  
20 23 1526 150 423786 5088412 Max T on previous sample was 7.8C.  
0 0 0     0 0 Not getting an increased temperature on the outlet thermocouple when pumping. Trying to determine why - massive leak? Also, big cloud of hydraulic fluid from ROPOS. Going back to cage. Dive terminated.  
20 37 1481 174 423781 5088406 ROPOS is in its cage and winding to surface.  
21 40 2 41 423705 5088548 21:30. ROPOS on deck.  
21 45 2 41 423705 5088548 Dive Summary: Vent fluid samples, nisken, suction samples of biota and deployment of osmosampler at Magnesia Vent. Video of plume. Vent fluid sample at OldWorms. Leak in HFS folowed by hydraulic leak in ROPOS terminated the dive.