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ERIC SUCAR staff Richard Kohler leafs through one of the many books he has on German U-boats in his Brick home last Thursday. Kohler, one of the cohosts of the History Channel show "Deep Sea Detectives," was also profiled in the 2004 best seller "Shadow Divers." He is standing next to a replica of U-869, a sub he and John Chatterton identified back in the late 1990s off the New Jersey coast.