Transcript for Sharks Taped Cheating at Casino
We have seen -- in the movies but now we have our first real life look at card sharks in action was one of the biggest cheating -- in history. The team ripped off millions from casinos across the country until they were caught on tape in San Diego. -- -- -- Ryan -- has more on how it all went down. The -- this house. When the guys get desperate for cash in the hangover they hit the casino and count cards. And why not it worked for those MIT whiz kids portrayed in the movie 21. They counted cards use hand signals and made off with millions. This is no movie. -- surveillance video obtained from the sick one gaming commission. Showing its casino outside San Diego specifically one blackjack table where everyone even the dealer. Is -- on the scam watch closely for clues. First this man in -- -- smoking his cigarette is actually whispering into a microphone in his sleeve he's reeling what cards the dealer just dealt to a -- on a computer. In a car parked outside. Next the dealer appears to shuffle the cards. But look closely. He just puts the corners together it looks like a shuffle even sounds like one. But the cards stay in the same order. Next it back to mr. smoker this time he signals to the players one finger on the cigarette means bad to means -- Until -- and a player needs to get close to 21 without going over with the dealer showing attend the player stays put with a sixteen. That's an odd move. But of course when you know what the next card will be it's also -- winning one. Then their luck runs out. The dealer is arrested this scam exposed the whole team put behind bars but not before they made off with a total of seven million dollars. Enough money to even keep those guys from the hangover out of trouble. For Good Morning America -- you know -- ABC news. But it didn't end well all the members you saw there either pleading guilty or are now in prison.
This transcript has been automatically generated and may not be 100% accurate.