All research submersible are unmanned
Answers
Manned deep-sea submersibles can provide us with valuable information about areas of the ocean that are incredibly difficult to study, but they are also incredibly expensive to operate. A more versatile and much less expensive way to study what’s happening below the surface is to use unmanned drones, typically called gliders.
Fleets of gliders can help researchers track marine life, pipelines, and oil spills, and can be used to defend harbors, ships and shipping lanes. With all of these benefits, why aren’t we using more of them?
Although they are becoming more common, we aren’t using gliders all the time, all over the place because we haven’t quite perfected the technology yet — getting the drones to communicate effectively with each other is the biggest challenge. Check out this great segment from BBC News to learn about the current state of unmanned underwater drones