The galleon San Diego, originally built as the trading ship San Antonio in Cebu, was hastily converted into a warship of the Spanish Navy around October 1600. Constructed under the supervision of European boat-builders, the vessel measured approximately 25 meters in length and featured a robust wooden hull. Its conversion included the addition of 14 cannons and a crew of about 450 men, designed to bolster Spain’s defenses against Dutch invasion threats in the Philippines. San Diego’s service history is most notable for its engagement in the Battle of December 14, 1600, near Fortune Island, Philippines. Under the command of Don Antonio de Morga, the ship was part of a small Spanish fleet defending Manila from Dutch forces led by Admiral Olivier van Noort aboard the Mauritius. The San Diego was significantly larger than the Dutch vessel, but structural issues and operational mistakes contributed to its demise. The ship was overloaded, with its gun ports widened for greater firepower but rendered unusable as water flooded the ship, and it lacked sufficient ballast for maneuverability. During the battle, the San Diego was struck by a cannonball or rammed, causing a leak that led to its sinking "like a stone" without firing a shot in retaliation. Nearly 400 years later, in 1992, the wreck was discovered by underwater archaeologist Franck Goddio near Fortune Island, lying about 50 meters below the surface. The site yielded over 34,000 artifacts, including Chinese porcelain, Japanese swords, Portuguese cannons, Mexican coins, European muskets, and navigational instruments, which provide valuable insights into early 17th-century maritime trade and warfare. The recovered artifacts, many in excellent condition, are now conserved and displayed in museums, notably the National Museum of Anthropology in Manila, emphasizing the vessel’s maritime and historical significance as a symbol of Spanish colonial naval history and early maritime warfare in Southeast Asia.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.