![](https://image.tmdb.org/t/p/w342/de8OORepBZTiHit18m4tCdlb2Lw.jpg)
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Hal, Ed, and Gail plunge to the lowest depths of the ocean in a special crystal bell to plant a second seismographic signaling device after the first one mysteriously disappears.
Prima Aeris Date : Sep 09, 1972
Aeris ultimum diem : Dec 02, 1972
Episode : 13 Episode
Season : 1 Season
runtime: 20 minutes
Studio: NBC
Patriam: