New Delhi, Dec. 7 :    New Delhi, Dec. 7:  The navy's claim of a break-in and a subsequent shootout in Admiral Sushil Kumar's residence lay in tatters with the naval establishment today saying that the marine commando, who was allegedly shot at by the intruder, had tried to commit suicide. The navy had earlier said that the commando, Satbir Singh, returned around three dozen rounds of fire at the intruder who shot him in his right thigh after being challenged on the night of December 1. The intruder, according to the navy, managed to escape. Delhi police have a different story. A report, to be submitted to the home ministry shortly, says no one broke into 12 Rajaji Marg, the navy chief's official residence, and that the alleged shootout was the result of a row between two commandos. Satbir is believed to have shot himself in an effort to implicate a colleague. Caught on the wrong foot after putting out the intruder theory, the navy today said that Satbir had claimed in his statement before the court of inquiry that he had tried to commit suicide as he was 'suffering from severe depression' caused by family problems. This leads to queries on who cooked up the story on the so-called intruder having left behind wires and cordex (mechanism to trigger an explosion) in the navy chief's house. Delhi police crime branch officers, who questioned Satbir twice, said the commando had an altercation with a colleague. An enraged Satbir shot himself in the thigh. In order to deflect the police's line of inquiry, the other guards fired 35 rounds to suggest that Satbir had tried to shoot the intruder.