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I have never hauled submersible wrecks from the seabed, but have recovered lots of other stuff from the same place. Depending on the weight and bulk of the com
by lb1lf 3y ago
I have never hauled submersible wrecks from the seabed, but have recovered lots of other stuff from the same place.
Depending on the weight and bulk of the component, you'd likely do one out of three (at this depth; in shallower waters, you have more options)
a) Small-ish items are simply dropped in a basket attached to the ROV doing the recovery, then brought back to the surface with the ROV.
b) Larger items may be handled by the ROV to a basket suspended from a winch, then hoisted to the surface.
c) If the items are too large for the ROV to handle, it will be used to attach a sling to the item, which is then in turn attached to the hook of a crane/winch, before being hoisted to the surface.
- dbancajas 3y agoand why did they do this? who paid for this recovery?
- lb1lf 3y agoIn the cases I've been involved in, it has largely been oil companies or their subcontractors footing the bill, occasionally scientists or, uh, treasure hunters. (I work for a company making this exact type of recovery gear, so every now and then I have to do some field work)
- csb6 3y agoThe U.S. Coast Guard is investigating the cause of the incident, so they are collecting evidence.
- jayrot 3y agoThe Navy also has the FADOSS, though it wasn't needed here I believe. It can lift insane amounts, at insane depths. https://en.wikipedia.org/wiki/Flyaway_Deep_Ocean_Salvage_System https://en.wikipedia.org/wiki/Flyaway_Deep_Ocean_Salvage_Sys...
- lb1lf 3y ago-This was interesting, thanks! It appears they utilize a passive system to dampen the effect of vessel movement, whereas in many (most?) other cases compensation is done actively by the traction unit (the twin drums with the rope looped over them in the center of the photo) and the storage winch (bottom) being wired to an accelerometer installed on the vessel. I guess the navy uses the passive system as it will be good enough and does not require that you spend time figuring out the vessel geometry to input the data into the winch control system - which is just another source of problems when you're in a hurry. I like this, it seems they've made the kit as simple and robust as possible while still fulfilling its intended purpose.