Japanese Submarine Bell Recovered Off Oahu in 2016

From the March 17, 2016, Phys.org.  "Bronze bell recovered from WWII aircraft-carrying submarine off Oahu coast."

The I-400 Japanese submarine had been lost since 1946 when it was intentionally sunk by the United States.

It lies in 400-foot deep water.

The Sen-Toku class were the largest submarines ever built until the nuclear submarines were constructed.

One of the 5 submarines of this class was bought to Pearl Harbor to be examined  The Soviet Union demanded the sub be turned over to them to examine and the United States sank it to prevent them from getting the advanced technology.

--GreGen