Did you hit "C" to order a (crash) dive when the plane was spotted, and then order periscope depth? If so, sounds like the Crash Dive Blues - a known bug. If you order a crash dive by hitting "C" you are ordering the boat to go to a preset depth (stock default is 70m) as quickly as possible. Ordering periscope depth or any other depth before the crash dive is completed can result in the boat continuing to sink out of control.
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