The newly invented deep sea diving apparatus of Dr. Hans Hartman (insert) of N.Y. noted submarine explorer and inventor, which he will go down to a depth of 500 feet off the North African Coast on his Mediterranean Deep Sea Scientific Expedition. He is to get data and photographs, which are taken with the camera on front of cylinder. Dr. Hartman is the only man to have attained a depth of 1500 feet.

Keystone View Company · [ca. July 1925]

[Information from item housing] Diving: Devices