The worlds oceans are vast and not properly researched, there are still tons of things down there about which we know nothing.
Would it be possible to speed up this process by crowd sourcing it?
Could we build small very resistant and cheap probes, with cameras, which could be produced in large quantities and help with that task?
Shouldnt it be possible to make them in a way that they will stay deep under water and be brought back to the surface by certain currents, so that they may be retrieved and the data collected?