This is a photo of me in Clear Lake, undergoing some physiological tests on experimental dives in Clear Lake, Oregon. This dive occurred either on June 14th or June 16th, 1971, only a few weeks after my discharge from the U.S. Air Force and return from Vietnam. The research was for two Ph.D. theses from University of Oregon Ph.D. students Alex McNeill and Joe Russel. Joe later went to the Institute of Environmental Stress at the University of California. Here I'm clearing my Champion Deluxe mask on a dive to a depth of 73 feet. The rig I'm using has two breathing cylinders, one on the right has a calibrated amount of air, and I needed to swim twice on a horizontal course at each depth (3 feet, 37 feet, and 73 feet), while the air consumption was monitored, my exhalations were sampled (using a center vacuum tank), and my cardiogram measured using what then was state-of-the-art printouts on paper.
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