My interruption of snorkeling

Snorkeling. Have you ever Snorkeled? Do you ever wonder when your snorkeling if a shark is coming to eat you? Or if the water that your snorkeling in just disappears and you go plundering down to the bottom. The fish at the bottom what whatever your snorkeling in swim peacefully across the bottom of the sand weaving their way trying to not hit each other. The mask your wearing might fill up flooding your mask forcing you to go up ending you journey of under the water.