Correct herfie,The average depth of the gulf is 190 ft. I served 4 years on a diesel,electric sub that was 312 ft long.End on it would stick out of the water here by 120 ft.lol. The Yuan is about 250 ft.At least if it sank in the gulf the men could just pop open a hatch and swim to the surface. We trained for that at Ford Island sub base in Hawaii.
FYI: I was at Queen Sirikit Naval hospital last year and noticed a couple Thai officers in uniform with submarine badges. What's that all about?