Full Fathom Five (1990)

Synopsis
In this action film, when Panama is threatened by an invasion of U. S. Troops, a group of radical Panamanians capture a nuclear sub from the Russians and station themselves outside of Houston, threatening to blow the city up unless the Americans meet their demands. It is up to American submarine commander McKenzie (Michael Moriarty) to stop the Panamanians and save Houston from annihilation. ~ Iotis Erlewine, All Movie Guide