1. The deepest I've gone was about 1500 feet, trying to shake some ASW helicopters, and it was in the Narwhal.
2. Fastest boat is hands down the Los Angeles class (unless you count Soviet subs) at around 33 knots submerged.
3. As for sonar, it's a bit more subjective. The Narwhal is certainly the quietest, but I've had far more luck with the Los Angeles class. It has the most advanced passive sonar systems currently in game, even though the Narwhal is quieter and interferes less.
Edit: Collapse depth is roughly going to be the test depth + 50% (as the US Navy defines test depth as 2/3rds of a vessel's design depth).
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