I take one on all technical & some solo dives.
Tip: don't forget (or neglect) to clean and prep that mask...someone may decide taking your mask would be funny, and if your backup mask is filthy and foggy, it isn't very funny.
Tip: don't forget (or neglect) to clean and prep that mask...someone may decide taking your mask would be funny, and if your backup mask is filthy and foggy, it isn't very funny.