Sunken Pillboxes Guarded Jap Coast (Mar, 1947)
I find this rather hard to believe. It doesn’t seem practical, nor does it seem that 40 people would be neccessary to man 3 torpedo tubes.
Sunken Pillboxes Guarded Jap Coast
Japan’s anti-invasion line went out under water at Tokyo Bay. Pillboxes were built into the hulls of sunken ships and equipped with three torpedo tubes and a sound detector. Each pillbox held 40 to 50
men who were relieved every 10 days. Food was canned; oxygen, bottled.