The decoded radio intercept that put subs on the convoy-did they arrive in time?
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The decoded radio intercept that put subs on the convoy-did they arrive in time?
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The decoded radio intercept that put subs on the convoy-did they arrive in time?
In this episode, we follow the four-day movement of Convoy Hi-Eighty-One from Imari Bay toward the Philippines and the American response mounted after ULTRA decrypts revealed the convoy’s route. We trace the convoy’s makeup, the unusual anti-submarine measures sailing with it, and the two wolf packs of U.S. submarines positioned by Vice Admiral Lockwood - but did those submarines intercept the convoy soon enough?
Date: November 14-15, 1944
Location: Yellow Sea / departing Imari Bay, Japan
Event: Convoy Hi-Eighty-One movement toward the Philippines
Forces: Japanese Twenty-third Division aboard four transports; U.S. six-submarine wolf packs
Intelligence source: ULTRA decoded Japanese naval traffic
- Convoy Hi-Eighty-One departed Imari Bay on the morning of November 14, 1944, carrying the Twenty-third Division south toward the Philippines.
- The convoy’s escorts included the escort carrier Shin'yō with 27 Nakajima torpedo bombers modified to carry depth charges for anti-submarine work.
- Vice Admiral Charles A. Lockwood received ULTRA decrypts detailing the convoy’s departure date, composition, and intended track through the Yellow Sea.
- Lockwood deployed six submarines in two coordinated wolf packs, placing them at specific coordinates to intercept the convoy’s expected path.
- On November 15 at 11:50 a.m., one transport, Akitsu Maru, was struck and destroyed in three minutes after contact with American torpedoes.
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