German soldiers are in a U-Boat and are being attacked by depth charges. They decide to surface after suffering numerous blows and the loss of several crew members.

After a submarine chase, Lt. Coffey's submarine falls off a cliff and goes deeper into the abyss. His vehicle implodes due to the intesity of the water pressure.

Beakman explains who made the toilet and then shows a cross-section of a toilet to show the inside. Then he uses colored water to show how gravity pushes the waste out of the toilet into the drain. He then shows how the back tank of the toilet works with valves and gravity to push the water in the toilet bowl down into the drain.

A series of simple machines help collect mushrooms and crush them to produce a drink for Dr. Robotnik.

Bill Nye show us how a circuit works by comparing electrons to water.