You'd think that Irwin Allen had exhausted the "disaster" genre by 1979. Think again: 1979 was the year that Allen put together the made-for-TV movie . Once again, a diverse group is trapped in a perilous situation; this time they're caught in an underground cave-in in an anonymous national park. The dramatis personae includes park ranger Dennis Cole, Cole's ex-lover (and state senator) Susan Sullivan, and fugitive convict James Olson. Also ensconsed in the subterranean tomb are Leslie Nielsen, Julie Sommars and Ray Milland. was shelved for nearly four years after its completion: it was finally given a network showing on June 19, 1983.