Submersible Capsule Launch

One complete 4-second launch sound effect for a deep-sea exploration capsule. A heavy docking clamp releases with a solid mechanical clunk, followed immediately by one short hydraulic pressure hiss, the capsule enters the water, and an electric motor spins up as it begins descending. This must be one continuous event with a clear progression and natural transition, no second launch, no repeated impacts, no clear splashy water, no music, no voice, no ambient background and no cinematic exaggeration. Use a thick enclosed industrial underwater perspective with restrained low-frequency body.