premise: A U.S. nuclear-powered submarine collided with a Japanese oil-tanker in the Straits of Hormuz late last night. Only minor damage to the tanker and no serious injuries were reported. The USS Newport News submarine collided with the stern of the Japanese oil-tanker, causing minor damage to the tanker. No personnel on either vessel were seriously injured, US Navy and Japanese government officials said. The straits of Hormuz connect the Persian Gulf to the Arabian Sea and is a major waterway for oil tankers.
hypothesis: Two submarines have collided.