From: (Pechs1)

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

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

Whoever wrote what you replied to is an idiot. Diesel subs are noisy only while
surfaced to recharge batteries but once submerged are extremely difficult to
detect.

China being so close to Taiwan could launch Diesl subs carrying ground troops
all the way across the straights in numbers large enough to take over Taiwan
with few being detected.

As a former member of VS-29 I can assure you submarines are hard to find and
submerged diesels are very hard to find.