Submarine Winch Loop

A seamless 5-second looping recovery winch sound for a deep-sea salvage game, heard from inside a metal diving capsule. Sustain a continuous low industrial motor, steel cable tension, water resistance and a subtle mechanical strain. Keep the texture steady with no one-off impacts, no alarms, no electronic beeps, no music, no voice and no water splash. The final texture must flow smoothly back into the opening so the loop has no gap, click or abrupt level change. Use a thick enclosed underwater perspective with restrained low frequencies.