Argon bottles for dry suit inflation, in an emergency, can be used for emergency air if the diver's main cylinder runs dry.

Using argon bottles for emergency air is not appropriate and could lead to dangerous situations during a dive. Argon is an inert gas commonly used for dry suit inflation due to its excellent thermal properties and low solubility in body tissues. It does not provide the necessary characteristics of breathable air.

In an emergency, if a diver's primary air supply runs low, accessing a source of breathable gas is critical. While argon is safe to use in non-breathing applications, it lacks oxygen and would not sustain human life. Therefore, in a diver's air emergency, it is essential to have a proper backup air source, such as a pony bottle or an alternate air source supplied with breathable gas, instead of relying on argon bottles. This ensures the safety and survival of the diver in challenging underwater situations.