Sinkage Avoidance

[LukeFF]

Originally Posted by gAiNiAc

The stock easy answer and approach is to get out ahead of the convoy, submerge deep and go silent, even all stop. After the initial destroyer screen passes over you rise to periscope depth for your attack.

That's NOT what you want to do. Placing your sub directly ahead of the convoy's path puts your sub in the search cone of the enemy's passive sonar. The better answer is to get ahead AND to the side of the convoy and (naturally) keep the periscope up for only short periods of time.