Linked from
The 13 pages that link to Remotely operated underwater vehicle, each with the reason it gives.
Deep-sea fishRelated: ROVs record deep-sea fish in place without bringing them to the surface.
Deep seaRelated: ROVs collect imagery and samples while operating under crushing pressure.
Abyssal zoneRelated: ROVs record video and collect samples on the abyssal seafloor.
Bathyal zoneRelated: ROVs document bathyal habitats and collect specimens beyond diver depths.
Deep-sea benthosRelated: ROVs document and collect organisms from deep-sea habitats.
Praya dubiaRelated: ROVs can film delicate siphonophores without collecting or damaging them.