Good surface procedures are imperative in every diving situation and are emphasised during the PADI Open Water Diver Course - have a fully inflated BCD, retain your mask and air source or as I always say to students, see, breath, float until you're on the boat!

If for any reason a diver cannot gain positive buoyancy via the BCD ditching weight is the fastest and safest method of increasing buoyancy in an emergency.

Remember, the most important feature of a weight system is its quick release mechanism for this very reason.