DENPASAR, Indonesia—A missing Indonesian submarine carrying 53 people is believed to have sunk in the Bali Sea after search teams found debris floating around the vessel’s last location, a navy official said. “With the evidence we found believed to be from the submarine, we have now moved from the ‘sub missing’ phase to ‘sub sunk'”, Indonesian Navy Chief of Staff Yudo Margono told reporters, according to Indonesian media Tempo. The exact location of the 44-year-old submarine was unknown but its presence had been detected, he said. Footage of the press conference showed officials holding debris that had been found including fragments of prayer mats and a bottle of grease used to lubricate the submarine’s periscope. Several Indonesian officials, including Finance Minister Sri Mulyani Indrawati, posted condolences to the families on social media. The KRI Nanggala-402 lost contact on Wednesday as it prepared to conduct a torpedo drill. “We are still …