Abstract
This paper describes a dive made in the bathyscaph trieste on July 3, 1957, with the writer as the scientific observer and Jaques Piccard as the pilot. This was the fifth dive of a series of twenty‐eight dives made during 1957 and sponsored by the U. S. Office of Naval Research. The dive lasted 2 hours and 31 minutes, with 36 minutes spent on the bottom.

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