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→Some cautions
Design an engine room entrance that has a double door. The inside door should be the watertight one (with a view port), and the outside one should be air tight. The space in-between would make a good place to hang ear protectors, etc. Both doors should have significant solid mass.
== Some cautions Cautions ==
Finally, some cautions. Some complex isolation schemes were described above, but you should keep the design as simple and robust as possible. For example: