Which mechanism limited deep-water salvage attempts of 18th-century shipwrecks when using diving bells?

💡 Explanation

When using diving bells in the 18th century, limited surface air supply meant diving bells risked exhausting breathable air due to consumption by the occupants, leading to asphixiation. Therefore air replenishment became a limiting factor, rather than crushing, visibility or currents which require advancements in different underwater-support technologies.

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