hobby. there is not really an objective but to just have fun! basically you put your mask on, wait until it gets dark and then you jump in the water with a flashlight and take a look at the night sea life. my dad actually goes down underwater and goes lobster hunting. with just a single breath. you try and find a lobster that is big enough (or legal size) and then you can take it and eat it or if you would like you can release it. there are many clubs that you can join to do this sport. this can take as long as you want, 10 minutes 