What is the practice of swimming on or through a body of water while equipped with a diving mask , a shaped tube called a snorkel , and usually fins ?
[[ File : AnnotatedOctopushPlayer.png | left | thumb | 200px | Annotated Player 1. snorkel and mouthguard 2. hat with earguards 3. mask 4. fins 5. stick 6. puck 7. glovePlayers wear a diving mask , snorkel and fins , and carry in one hand a short stick for playing the puck .