April 24, 2014 Infographic: Bluefin-21 Being Used to Find Malaysia Flight MH370 Search for the missing plane has been using the sophisticated Bluefin-21, a robotic underwater vehicle which could travel up to 5km deep in the ocean. Fact file on the Bluefin-21 undersea search vehicle. – AFP infographic, April 15, 2014. Share this:TwitterFacebookLike this:Like Loading... Related