'It could have snagged on an old fishing net on the seabed. It could have been on parts of the [Titanic] wreckage itself,' professor Simon Boxall said.
on Sunday, and as crews continue to search for it, concerns about why it has not resurfaced have arisen.
"For some time, we have been unable to establish communications with one of our submersible exploration vehicles which is currently visiting the wreck site of the Titanic," OceanGate Expeditions, which owns the missing submersible,on Tuesday."Our entire focus is on the well-being of the crew and every step possible is being taken to bring the five crew members back safely."
"You could adjust the buoyancy...which would sort of push the submarine up or down, you could use thrusters," Boxall said."And you can, in principle, ditch some of the ballast...which then make[s] it buoyant."
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