Debris has been recovered from a missing Indonesian submarine, the country’s navy said Saturday, suggesting that the stricken vessel could have broken apart after sinking with 53 crew aboard. The development dashed already slim hopes of rescuing the sailors alive after their oxygen reserves were understood to have run out earlier in the day. Warships, planes and hundreds of military personnel have been searching for the KRI Nanggala 402 since it disappeared off the coast of Bali early Wednesday. Authorities earlier said the German-built craft was equipped with enough oxygen for only three days after losing power. That deadline passed Saturday morning. The navy’s chief Yudo Margono said a search party had recovered fragments from the submarine including items from inside the vessel — pointing to a catastrophic accident.