down. the heavy display collapses on top of a saleswoman below. a crowd rushes to pull the trapped woman from the rubble. 15 people are injured in the accident, and most are treated for minor cuts and bruises. but one male customer suffers a broken leg. three lemon sharks and many small fish and turtles are killed. the cause of the sudden rupture, according to a government official, a dip in the outside temperature made the tank's acrylic glass walls brittle. causing them to give way in an abrupt and powerful explosion. coming up -- seeing isn't always believing. >> translator: your brain takes what you see on the surface of the water and makes you imagine the depth of field. >> when "caught on camera: don't