Jacques Piccard was a Swiss oceanographer and engineer, known for having developed underwater submarines for studying ocean currents.

What happened Jacques Piccard?

GENEVA (AP) — Jacques Piccard, a scientist and underwater explorer who plunged deeper beneath the ocean than any other man, died Saturday, his son's company said. He was 86. Mr. Piccard died at his Lake Geneva home in Switzerland, according to the company, Solar Impulse.

Did Jacques Piccard die in the Mariana Trench?

Fifty-two years earlier, in 1960, U.S. Navy Lt. Don Walsh and Swiss oceanographer Jacques Piccard reached the Challenger Deep in a submersible called the Trieste. Piccard died in 2008, but Walsh is still involved in ocean research and was a key adviser on Cameron's team.