Dictionary of Ichthyology  

remotely operated vehicle = a vehicle that dives in deep water to film deepsea organisms such as fishes. It is controlled from onboard ship and carries no passengers. May be equipped to capture fish or lay traps. Abbreviated as ROV.

Wikimedia Commons: http://commons.wikimedia.org/wiki/File:US_Navy_020524-N-0096V-002_Remotely_Operated_Vehicle_(ROV).jpg

Canadian Museum of Nature