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The B-427. A Foxtrot-class submarine built in 1971 for service in the Soviet Pacific Fleet. Upon the dissolution of the Union, the aging submarine was declared surplus to the Russian Navy's requirements and retired in 1994, shortly thereafter it was purchased and moored alongside the Queen Mary as a tourist attraction for the better part of 20 years before the museum closed in 2016 and the ship fell into near complete disrepair (still in better shape than the Admiral Kuznetsov though). Today, it lies abandoned with the gates welded shut to discourage the curious from boarding. The City of Long Beach has spent years trying to get rid of the submarine, not just because of its unsightly appearance but, because it would seriously damage the Queen herself if it were to capsize. So far however, its remains in place.
I actually visited the B-427 in 2012, a few years before its closure, but that's a story for another time.