this post was submitted on 27 May 2024
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If you have an air line to the surface, then running the enclosure at positive pressure to negate the force of water pressure at depth might be a starting point.
I would also reconsider whether a linear actuator is the right approach. A hydraulic piston external to the housing where your motor resides reduces the complexity of any waterproofing, and might be a better approach if you're dealing with significant depths/pressures.