The Alan A. Dale is the only known sinking contributed to a German Biber-type midget submarine of the K-Verbände (i.e. small battle units or commandos). After being hit by the torpedo on Dec. 23rd, 1944 she drifted ablaze for 3 days before going down. Her wreck was discovered in 2001 during survey operations for the forthcoming deepening of the Scheldt estuary. At least 38 wrecks had to be removed, the Alan A. Dale (430 ft length) was the largest one. Finally in June 2003 the remains of the Alan A. Dale were dispersed.
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