Deep Sea Capsule Ambience

A seamless 10-second underwater exploration ambience loop for a deep-sea salvage game, heard from inside a small metal diving capsule. Build a continuous bed of deep low-frequency ocean current, distant hull metal stress, sparse soft muffled bubbles and an extremely quiet hydrophone rumble. The entire texture must be thick, distant and enclosed, with high frequencies strongly reduced around 2kHz and above. Do not use clear bubbles, bright shimmer, clean splashes, sonar, music, voice, one-off impacts or sudden peaks. The final texture must flow smoothly back into the opening with no gap, click or level change.