In October 1999, Kaikō performed a robotic mechanical operation at a depth of 2,150 meters off the coast of Okinawa near the Ryukyu Trench, connecting measuring equipment with underwater cables on the sea floor.
Ryukyu Islands | Ryūkyū Kingdom | Rocky Mountain Trench | Fiachra Trench | Anthony Chenevix-Trench | William Le Poer Trench | United States Civil Administration of the Ryukyu Islands | trench warfare | Ryukyu Kingdom | Ryukyu | Richard Chenevix Trench | William Trench, 1st Earl of Clancarty | Trench warfare | Trench railways | Ryukyu Trench | Ryūkyū-kan | Richard Trench, 2nd Earl of Clancarty | Mariana Trench | Herbert Trench | Frederick Trench, 1st Baron Ashtown | David Trench |