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Most stuff runs outside of the capsule including power and dangerous ammonia. They use connectors that fit to the hull and have plugs on each side. Gases/liquids can be controlled with valves. And parts can fit tightly together to make a seal. The stuff running through the hatches is designed to be quickly disconnected in an emergency.

I guess the main question about this kind of routing is if things are safer kept on the unpressurized side or not. And that the risk of a small hole on the hull is offset by reducing the risk of leaks in the pressurised area.