Almost any ROV technician will have a story of a near miss, an entanglement or a lost vehicle. About 6 months ago, Ran, an autonomous underwater vehicle, was lost while exploring under Thwaites Glacier in Antarctica (a.k.a Doomsday Glacier).
Not long before Ran got lost, it had been able to return some amazing maps of the underside of a glacier, giving scientists new insights into the interactions between the ice, fractures within it and water flowing beneath it.
Full article at: The U.S. Sun 02feb24 and Marine Technology News 02aug24