Crystal Sub Tank of the cards

EFFECT

The Crystal Sub Tank (AKA Suspended Animation)  trick is one of the most popular among modern magicians. In it, the magician gets into an elevated box. It is covered with a curtain, but his hand is visible at all times. The assistants stands beside the box, and throws a cloth over himself, with one end held by the magician. The cloth comes down, and in a split second, the two have switched places. In this trick, the effect is replicated with a pair of cards

YOU WILL NEED

(FOR THE TANK)

• Some sellotape
• A rectangle of card. You should be able to fold it into an open cuboid, big enough to fit the whole deck with some extra space
• A Toilet Roll
• Clingfilm or a freezer bag
• A square of cardboard bigger than the roll, or cuboid
• Some kitchen foil
• A sheet of paper

(FOR THE MAGIC)

• A Deck of Cards
• A Helpful volunteer
• Knowledge of some card sleights- Namely the control and double lift

PREPARATION

(For The Cards)

There are two main sleights that are needed:

1. First of all, the CONTROL. While the card is being selected and looked at, take the top half or so of the rest of the deck and hold it in one hand. Hold the bottom half of the deck in the other hand. Have the volunteer put the card on the bottom half. Hold the ring finger over the chosen card-not by much, a few milimetres will do.This is called a "Finger break" and is key to both of the sleights in this trick. Put the top half over it. "Cut" the top half of the deck to the bottom. Due to the break, the chosen card will be left on top of the deck
2. Secondly, the DOUBLE LIFT. Hold another break under the card second from top. Using the ring finger holding the break as a lever, lift up the top two cards at once. They will look like one card, so it look like you are only handling the top card, which appears to be different to the chosen one (The top card is actually the chosen one

(FOR THE TANK)

1. Fold the cardboard into a cuboid, securing it with tape. Cut out two rectangles of the bag/clingfilm. Tape them each to either end of the cuboid. Cut a hole in one of the windows big enough to put a card through.
2. Stand the cuboid on top of the loo roll, and tape the two together. Attach the other end of the loo roll to the cardboard base. 
3. Cut a hole big enough to put a card through into the foil. arrange the foil so it covers the box, with the hole in the foil in line with the hole in the bag/film. The Tank is now ready

PERFORMANCE

1. Have the volunteer pick a card from the deck. Using the control sleight, move the chosen card to the top of the deck. Tell the volunteer that this will be the magician. Do some fake shuffles to keep the chosen card on top of the deck
2. Perform a double lift to show an indifferent card. Tell the volunteer that this will be the assistant. Remove some of the sellotape from the door with the hole in to open it
3. Place the top card (assumed to be the assistant) beside the tank. Put the rest of the deck in the tank, and replace the tape and door. Put the card on top of the incomplete deck (Assumed to be the magician) through the hole. Place the foil over it, passing the magician card through that hole as well
4. Cover both cards with the paper for a second, then turn over the card beside the tank to reveal it as the "Magician" card
5. Remove the foil, open the box by removing the tape, and reveal that the card that has been protruding from the holes the entire time to be the assistant!