Shipwreck explorer Joe Mazraani, 48, died during a deep-sea dive off the Massachusetts coast, as the investigation into his death continues.

Vintage photos show how deep sea diving and exploration has evolved over the years ...

P.H. Nargeolet, a French deep-sea explorer and Titanic expert, was one of the five men who died on the OceanGate implosion. His estate is now suing the company for wrongful death.

This luxurious, patented, all-metal diving suit featured the latest in deep-sea technology, including automobile headlights on its shoulders.