A group of thieves led by El Uruguayo is set to rob a bank in Valencia. Their purpose is to steal as many safety boxes as possible and then flee through a dug tunnel that communicates the building with an abandoned subway station. However, the press officer of the Prime Minister discovers what the thieves are actually after: they want to get their hands on box 314, where Gonzalo Soriano, a former member of the government who slipped into a coma after a severe accident, left documents with compromising information. The gang's plans start to go awry when the tunnel is flooded by heavy rain, leaving them with no escape. Also, despite the robbery being a setup by a faction of the governing party, the bank's security personnel has not received the instructions to let them flee...