Aquarian Illusion

From MagicPedia

The Aquarian Illusion is a variation of the Metamorphosis or Substitution Trunk. It was created by Alan Wakeling for Mark Wilson, who performed it in The Magic Circus series and a HBO special Mumbo Jumbo! It's Magic, and in closing his Las Vegas shows.

The illusion consists of a large tank made of acrylic glass with a lid. The tank is filled with water and a lady assistant then climbs inside. She takes a deep breath, then submerges underwater. The lid is then secured to the tank with padlocks and chains wrapped around the tank and also padlocked. The beautiful woman is now trapped underwater, with no apparent source of air.

A curtain is lowered over the tank, concealing it from the audience. The magician ducks inside the curtain, sticks his head out twice, counting "One! Two!", then the third time, the assistant sticks her head out calling "Three!" The curtain is then parted, revealing the magician now locked inside the tank.