Wreck of the Constellation / Montana - the wreck that Peter Benchley based the book "The Deep" on.
The wreck of the Constellation sank while carrying a load of cement on deck (probably had something to do with it) - when the ship sank, the canvas bags rotted away, and the cement cured, leaving it stacked up like pillows. It was also carrying sheet glass (you can see the shards in the background) glass bottles, and of course, the famous MORPHINE AMPULES! The Montana later drifted into the wreck of the Constellation, and the two are now on top of each other.
D.