[John Pancoast]

Originally Posted by Subtype Zero

Tense moments with NYGM!

Setting: Early November, 1940 6:45 p.m. 150 km west-south-west of Gibraltar. Tracking a large convoy. Light seas, good visibility. Got inside outer lanes of convoy, sighted two transports. Two torpedoes each. Instantly sank the first transport, missed second. Dived to evade, but did not think to submerge under ships in convoy. Quickly located and pinged by escorts, dived to 120 meters. Hunted and depth-charged by four escorts for two-and-one-half hours. Light damage to flak gun, no other damage.

Eventually, three escorts left and went back to the convoy. Continued to be hunted by a Flower class corvette. This single escort continued to ping me, even after he ran out of depth-charges, for another NINE hours!! No matter how I evaded, he always seemed to know right where I was (this was before I learned that the sound of exploding depth-charges does NOT mask your sound of moving away). Out of desperation, I rose to periscope depth and fired an aft torpedo, which missed, of course. For some reason, he seemed to have more difficulty acquiring me at periscope depth and he eventually gave up and just before dawn, I escaped.

If anything, SH3 with NYGM will teach you to be patient!

Unfortunately, the noise of ships propellers in a convoy don't mask you either like it should though getting under them at least makes them physically get in the way of escorts which can help somewhat.
Also, 120 meters isn't deep enough.