Which one of the following is the correct procedure for checking the non-return valve on the bandmask or helmet immediately prior to a dive:

Which one of the following is the maximum DC voltage which can be used safely underwater without protective electrical devices:

When a diver is about to commence cutting using oxy-arc equipment, the supervisor must ensure (from a safety point of view) that:

Outboard engines used in diving operation should be fitted with which one of the following:

If a sluice gate has to be opened whilst there is a diver in a dock, which one of the following actions should be taken:

An imminent gale warning means that a gale is expected within:

A diver is working at 100 fsw for 30 minutes. What volume of gas will he use? (This is an Imperial calculation)

Which one of the following conversions is correct?

Assuming a diver was working in a cold water environment what is the most likely method of heat loss?

A lightweight LP compressor delivers 250Ltr/min at a pressure of 17 Bar. Assuming two divers are working at 30msw what is there expected gas consumption at 35Ltrs/min and is the compressor sufficient?