The submarines from other countries are diesel and noisy and
therefore not all that much of a threat. BRBR

Not a bubblehead but the biggest threat today is from Chinese diesels, running
on battery power, in the Tiawan straights, waiting for a CV..
P. C. Chisholm
CDR, USN(ret.)
Old Phart Phormer Phantom, Turkey, Viper, Scooter and Combat Buckeye Phlyer