Mysteries of the deep

Here is one to chick off this new thread:

The mystery blob photographed onboard the NOAA vessel Okeanos Explorer after collection.
(NOAA Ocean Exploration, Seascape Alaska)

Anybody want to venture a guess??

A piece of the Go’uald ship taken out by SG-1?

Looks like the top off the Golden Rivet.

Not a mystery but something seldom seen and not well known:

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