The years leading up to World War II saw a continuation of the policy of experimentation that had characterized the first years of submarine activity. However,World War I had proved the submarine's role as a viable attack weapon, and the march of technology had turned the focus of submarine work away from seaching for a role in naval warfare and toward making submarines better, more effective, weapons.
Even with the benefit of improving technology, submariners still had some difficult leasons to learn.
The following submarines were involved in serious accidents during this period:
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This page last updated 25 January, 1998.