Is it possible that you can keep the carbon fiber hull as a solid piece with no penetrations, making it more watertight? I kind of envision this craft as being

Is it possible that you can keep the carbon fiber hull as a solid piece with no penetrations, making it more watertight? I kind of envision this craft as being a sealed capsule full of humans with all the propulsion equipment and batteries strapped to the outside and controlled wirelessly from the inside. But I haven't seen a full diagram of how Oceangate worked. Like, how did CO2 get scrubbed from the cabin?