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The London Olympics could cost five times what was originally budgeted, a massive £12B.
A Sky News investigation has found that figure could grow even higher if you take into account other costs.
The government says the figure's not right and Sky News has included costs which aren't directly linked to the games.
Olympics organisers kick start one of the biggest recruitment drives in a century in East London later as they look for security guards for the games.
They hope 15% of people living in the area will get jobs.
Once complete the security team will be around 23,000 strong.