THE Marauding I.J.N. AIRCRAFT

In the 1980s, an accidental discovery was made of a trio of historic (and, in Tokyo, virtually priceless) WWII aircraft flown by Imperial Japanese Navy pilots. Their exploits include having engaged in the 7 Dec 1941 sneak attack on Pearl Harbor, Hawaii.

Due to the depths involved, these deep ocean extractions can only be performed by robotics. 

Superb subject for a documentary film, and at least one episode in the AR series.