Japanese Patrol Boat

The Japanese Patrol Boat wreck is a popular dive site in Subic Bay, Philippines, located in Triboa Bay near the end of the runway, close to the LCU wreck site. This 42-meter (120-foot) vessel, believed to be a converted deep-sea trawler or submarine chaser, was utilized by the Japanese Navy for patrolling Subic Bay during WWII. It is thought to have been sunk by US Navy dive bombers in 1944 or 1945, shortly before the liberation of Subic, with evidence of a significant blast on its starboard side near the bow. The wreck now rests upright on a sandy bottom, with its top at approximately 18 meters (60 feet) and the bottom at 24 to 26 meters (75 feet). While still largely structurally intact, recent earthquakes around 2015 have caused some internal damage, collapsing the galley and parts of the forward deck, making deep penetration no longer recommended. Despite this, features such as the port-side anchor, a large bow winch, and four of the six engine cylinders are still visible.

The Japanese Patrol Boat is considered one of the more pleasant dive sites in Subic Bay, attracting abundant marine life and often offering good visibility. The wreck is covered with hard and soft corals, transforming it into a thriving artificial reef. Divers can expect to see a variety of marine species, including vibrant soft corals, sponges, and crinoids, with Red Snapper, Sweetlips, and Batfish commonly sighted. Schools of juvenile fish often find shelter within its compartments, and stingrays can be found in the sand around the stern. Visibility at the site typically ranges from 7-13 meters (20-40 feet), but can vary with currents and tides, sometimes dropping to a few meters or extending to over 15 meters. Currents in the area are generally mild, but can occasionally appear and reduce visibility.

The dive is suitable for Open Water Divers, although some sources classify it as suitable for Advanced Open Water Divers due to its depth. Beginners are advised to be accompanied by an experienced Divemaster. The generally calm conditions and diverse marine life make it an appealing site for photographers and videographers. Subic Bay's water temperature typically ranges from 27-29°C (80-84°F) year-round, with the coolest temperatures between December and February. The best diving season in Subic Bay is during the dry season, from November to May, with optimal visibility usually occurring between February and May. During these months, lower winds and rainfall contribute to calmer ocean conditions. While diving is possible year-round, the rainy season from June to November can bring more variable visibility and a higher risk of cancellations due to potential typhoons.