Submersible Power Failure

One complete 4-second deep-sea exploration capsule failure sound effect. Start with a short restrained cabin alarm, then the console power drops, the electric motor winds down and stops, metal pressure creaks through the hull, and the capsule sinks into a low underwater rumble. This must be one continuous event with a clear progression and natural ending. No explosion, no scream, no voice, no music, no ambient background and no exaggerated horror sound. Use a thick enclosed metal-underwater perspective and an ominous but controlled tone.