You know the feeling. You’re suited up, ready to descend, and the moment you hit the water your mask fogs. Suddenly the dive becomes a squinting exercise instead of the experience you were looking forward to. Most divers just accept the underwater ritual: flood, clear, repeat, and hope for the best.  Instead of trying to fix the fog, Cressi’s idea was to stop it from forming in the first place. The Fog-Stop System on the Cressi Prisma mask has numerous...