lol thanks

This is true, however, it is only designed for 60ft. I don't think they'd go in a lake much deeper than that. Worse case scenario they should have a valve on the hatch to flood the compartment incase they need to equalize pressure and GTFO. Of course, a rebreather/oxygen tank would be helpful for that because no human can hold their breath for that amount of time and swim to the surface.

@williamsplays8528 yeah, an escape breathing apparatus would be good, along with a way to make the occupants' compartment into an escape trunk. It would be important to waterproof the electronics inside. There are probably some decompression considerations that need to be considered as well. Personally, if I were designing such a submersible, I'd aim to make the cabin positively buoyant and have a way to release it from the rest of the body. Also, if you're designing the ballast control, use a tee valve that only allows you to connect two adjacent positions at once. With the connection to the ballast tanks in the middle position, there is no way to connect the compressed air supply to the vents.

What? - The vent valves (to release air, to submerge) are closed just as the top of the hatch is level with the water. The main ballast tanks are soft tanks "bottom always open". They can do a emergency blow at any time. The trim tanks are hard tanks. Top vent valve in addition to a lower valve. Those I trim for neutral buoyancy. Those tanks, you would need to open the lower valve to blow the water out. But I think you were confused, an emergency blow is easy with the main tanks. As for electrical fire, although everything is fused, I have onboard scuba to breathe while resurfacing/or flooding it. Decompression isn't an issue because the flood valve flow rate at max depth of 60ft is about 300gpm at that PSI depth. It would take 2 1/2mins to flood allowing plenty of time to adjust to the pressure equalization and swim out. Last thing I figure I'll mention, for the redundancy of the ballast: The fore, aft and main tanks all have separate airlines. Hope that clarifies it. lol

@PlanesBoatsandSubmarines if I understand you correctly, you are relying on the administrative control of "I close the valves at the proper time". That's something, but it's not great. If you forget to close those valves before opening the valves from the compressed air supply, nothing stops the compressed air from being dumped overboard. An engineering control preventing the vent and blow valves from being opened simultaneously would be superior.

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Def not. They have zero interest in something that goes 3mph in lakes, with a short range of 2 miles. Let alone, I'd ignore it. Or better yet, partner with the DEA if they did to take em out.