GreyEilesy

GreyEilesy t1_ja2gso9 wrote

From a simple google search, neither of those claims are true.

Ironclads were invented by the French navy and submarines have been designed multiple times since the 16th century. And even if you stretch it to only include metal submarines, there is the Brandtaucher which predates the confederacy by 10 years.

https://en.m.wikipedia.org/wiki/Brandtaucher

18