The sleeve states the following:

'In 1977 a geological expedition discovered exotic forms of sea life, a mile and a half beneath the surface of the ocean, where no sunlight penetrates. In 1979 a team of scientists, headed by geologist, Dr Robert Ballard, and biologist, Dr J Frederick Grassle, set out on the mother ship 'Lulu' and research vessel 'Gilliss' to relocate and explore these warm water vents and, hopefully find new ones. The special follows this multi million dollar deep diving expedition near Galapagos islands. The Galapagos Rift is a chain of underwater mountains extending 40,000 miles through the oceans. All along the ridge, the earth's crust is constantly pulling apart. Volcanic activeity creates fissures in the ocean floor. ....'

1986. Video Library. Deleted title. SV1026. Cert: . Running time: 60 mins.