6. A Torpedo That Consistently Failed to Detonate

Despite the fact that the Mark 14 itself had never undergone any live tests, it was issued to the US submarine fleet as its standard torpedo in 1938. It was only after America joined WWII that the torpedo’s grave flaws became apparent. Within the first month of hostilities, submarine commanders correctly reported that the Mark 14 often failed to maintain accurate depth so as to pass within the correct distance beneath an enemy ship’s keel. Another problem was with the magnetic detonator, which frequently detonated prematurely or failed to detonate at all. The simpler contact detonator often failed to set off the torpedo, even when it struck an enemy’s hull at a perfect angle with a loud and clearly audible clang.



