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Lalartu comments on The Octopus, the Dolphin and Us: a Great Filter tale - Less Wrong
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It is not a major problem at all. Given that creatures have hands and can keep them out of water, they can build a bloomery inside a diving bell.
Chicken and egg problem. What are you building the diving bell out of?
More to the point, why would they want to? What would drive them to do so?
For example, out of animal skins. This construction is supported by internal pressure, it does not need strength.
Want exactly what? If "smelt metal", then probably the same as humans, accidentally placing copper or tin ore in furnace. If "having underwater furnace" - it is easier to operate than one placed on raft. If "why use fire at all" - to make watertight pottery.