Seawater is effective radiation shielding, so an ordinary airborne detector would not simply reveal a deeply submerged reactor. The later exchange raises isotope-sniffing and reported submarine-mounted systems that search for trace products in water rather than direct reactor radiation. The details remain uncertain, making the segment useful as a distinction between direct radiation detection and specialized chemical or isotopic surveillance.
Notable Point · 3:30:20-3:35:52
Radiological clues from nuclear submarines
A detection discussion separates the poor underwater reach of a simple Geiger counter from specialized systems intended to find traces associated with submarine cooling systems.