[Bubblehead1980]

Originally Posted by ETR3(SS)

I believe it was the Cachalots that first employed an all welded hull.

http://www.valoratsea.com/boats2.htm

Hmm never before read the Cachalots were welded.How do explain the vast difference in the Cachalot and Balaos test depth? Perhaps Balao was all welded construction.Not sure.