Acoustic Measurements in Deep Water Using the Bathyscaph Available to Purchase

The Bathyscaph Trieste made a series of dives for scientific purposes in the summer of 1957 in the Mediterranean Sea. Part of the work consisted of simple acoustic measurements in the 10‐ to 500‐cps frequency range, and is herein described. Ambient noise levels were measured with some detail as a function of depth, sea state, and frequency; and pressure levels from a surface source were measured as a function of depth at different ranges, one range before the energy concentrated in the sound channel, and one range afterwards. Finally, the capabilities and limitations of the Bathyscaph as a vehicle for acoustic experiments are discussed.