I don't think U.S. boats actually entered the Inland Sea. That's the body of water in between the Islands of Honshu and Shikoku.
I think your thinking of the Sea of Japan, the body of water between Japan and Korea / Manchuria.
U.S. boats were very wary of there, especially after the Wahoo was lost exiting the La Perouse Strait in Oct. 1943.
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