On the Beach is a 2000 apocalyptic madefortelevision film directed by Russell Mulcahy and starring Armand Assante, Bryan Brown and Rachel Ward. It was originally aired on Showtime.
The USS Charleston SSN704, a 688i variant Los Angelesclass submarine, is equipped with a caterpillar drive and is on station following a nuclear exchange, under the command of Dwight Towers.The nuclear war, vastly contaminating the northern hemisphere, was preceded by a standoff between the United States and China after the latter blockaded and later invaded Taiwan. Both countries are destroyed, as is most of the world. The submarine crew finds refuge in Melbourne, Australia, which the radioactive fallout has not yet reached though radio communications with several radio operators farther north than Australia indicate that radiation has reached their countries and will be in Australia in a few months. Towers places his vessel under the command of the Royal Australian Navy and is summoned to attend a briefing. ........
Source: Wikipedia