Title: Oil Spot and Oxygen Running Out: The Mystery of the Indonesian Submarine's Disappearance

As Indonesian authorities continue the search for a missing submarine, defense officials stated on Thursday that the sailors aboard have enough oxygen until Saturday. No signs of the submarine "KRI Nanggala-402" or its crew of 53 have emerged as of Thursday afternoon, and the search and rescue operation remains ongoing under stable weather conditions. Yudo Margono, Chief of Naval Staff, indicated that there will be sufficient oxygen for the sailors until Saturday, confirming that the submarine was seaworthy, saying, "It was ready for combat," according to Reuters. Margono made these remarks at a joint conference with the Indonesian Army Chief of Staff and Defense Minister Prabowo Subianto in Bali, following the submarine's disappearance during exercises north of the island. The Ministry of Defense reported that the 1,395-ton submarine was built in Germany in 1977 and joined the Indonesian fleet in 1981. The submarine underwent a two-year maintenance period that ended in 2012 in South Korea. Prabowo acknowledged that it is "essential to update our defense equipment more quickly," but he did not mention any issues with the submarine. According to officials, aerial searches have discovered an oil spot near the submarine's original location, and two navy ships equipped with sonar devices have been deployed to assist in the search.