1989 Event After 12-year, 4-billion-mile journey, Voyager 2 flies over cloudtops of Neptune and its moon Triton, sending back photographs of swamps 1960 Event 1st submerged circumnavigation of Earth completed by Triton 1960 Event U.S. nuclear submarine USS Triton set off on underwater round-world trip 1939 Event British submarine Triton torpedoes British submarine Oxley 1846 Event Neptune's moon Triton discovered by William Lassell
