The Mythbusters build an air cannon to see if a ping pong ball projectile can be lethal. They test the effect of water pressure on a deep-sea diver and find out if the pressure in a fire hose is enough to lift a car.

The MythBusters investigate six myths about pressure. They build a pressure cannon to see if a ping pong ball impact could be fatal. They also test the affect of water pressure on a deep sea diver, find out if firehose pressure is enough to lift a car; if a bullet can be fired in space; if a vacuum cleaner can lift a car; and if steam followed by rain can cause a railroad tanker car to implode.

The team test if people can be electrocuted by lightning while talking on the phone, if a stun gun could use water instead of wires, and if peeing on the electrified rail of a subway line could give a fatal shock.

The team find out if a skydiver can streamline their body like Keanu in Point Break, if a penny dropped from the Empire State Building could kill a person, and if it was paint and not hydrogen that caused the Hindenburg disaster.