Alvin research submarine mechanical hand test dive
Photograph of the Alvin underwater research submersible, owned by the U.S. Navy and operated by the Woods Hole Oceanographic Institution. Supplied caption: 'Alvin's mechanical hand, manipulated from inside the pressure hull, snatches a seashell and holds it up for inspection. The one and a third inch thick steel spherical pressure hull is six feet, ten inches in diameter'
Schulke, Flip, 1930-2008
Flip Schulke photographic archive