Pipe Goggles and Tools
Pipe goggles, are a solutiont to seeing underwater, when you want to go very deep on one breath. Since every 10m pressure doubles and it take another volume of air to equalize fill the same space. You need eventually use a bit of your breath just replacing the air in your mask. Here is a pair of swim-goggles converted to deep diving equalizable goggles. I just added tubing to join the air spaces and have a tube go into the mouth for equalization.
Pipe Goggles and Tools
Pipe goggles, are a solutiont to seeing underwater, when you want to go very deep on one breath. Since every 10m pressure doubles and it take another volume of air to equalize fill the same space. You need eventually use a bit of your breath just replacing the air in your mask. Here is a pair of swim-goggles converted to deep diving equalizable goggles. I just added tubing to join the air spaces and have a tube go into the mouth for equalization.