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.

• Which phenomenon limited the height of brick masonry arches in ancient Roman construction?
• Which optical consequence affected early camera obscura image quality derived from a single, uncoated plano-convex lens?
• Which outcome resulted when 18th-century warships enforced a strict caulking schedule on their wooden hulls?
• Which outcome occurs when unsupported sections of Gothic cathedral stained-glass windows deform outwards under wind load?
• Which constraint complicated design challenges regarding fortification defense for Roman castra during sieges?
• Which risk increased for bronze tools when Mesopotamian smiths exceeded annealing temperature?