Massive air defenses on East Britain?

[Aktungbby]

In large boats (type IX C, IX D, X B and XIV) the pre flooding of the forward ballast tank or the forward and center diving tanks on crash diving is left to the judgment of the Commander.
In well run front boats it is customary and there is no objection to it.

Not aboard the U-505 (now in Chicago) Some crewmen were just considering going heavy due to the boats vulnerability: low clouds, incessant radar, and poor lookout visibility as referenced in Goebbler's book when this happened> A crippling Hudson attack which destroyed the attacking aircraft and compelled a long journey back to Lorient. The sub's pressure hull took several days to repair before a shallow dive could even be attempted. "On 10 November near Trinidad, U-505 was surprised on the surface by a Lockheed Hudsonmaritime patrol aircraft from No. 53 Squadron, Royal Air Force, which made a low-level attack, landing a 250 lb (110 kg) bomb (Actually 4 depth charges) directly on the deck from just above water level. The explosion killed one watch officer and wounded another in the conning tower. It also tore the anti-aircraft gun off its mounting and severely damaged the ship's pressure hull. The aircraft was hit by shrapnel from the bomb's explosion and crashed into the ocean near U-505, killing the crew. With the pumps inoperative and water flooding the engine room in several places, Kptlt. Zschech, a suicidal martinet, ordered the crew to abandon ship, but the technical staff (led by Chief Petty Officer Otto Fricke) insisted on trying to save her. The vessel was made water-tight after almost two weeks of repair work. After sending the wounded watch officer to the supply submarine ("milk cow") U-462, U-505 limped back to Lorient on reduced power, earning the distinction of being the "most heavily damaged U-boat to successfully return to port". [wiki] [Goebeler, Hans Jacob, with Vanzo, John. (1999) Steel Boat, Iron Hearts: The Wartime Saga of Hans Goebeler and U-505 (Wagnerian Publications] Screw regulation! go heavy...Herr Dönitz is a forgiving 'old lion'!