around the world under the sea (1966)

"I want no part of it!"
Frightened about climate change, and the effects it is having on the world, the US govt decides to use a newly developed 'hydronaught', with a top notch crew (inc Lloyd Bridges, David McCallum, & Shirley Eaton), to travel the world oceans, and plant early warning sensors on the ocean.
Campy underwater adventure film, that seems to be an amalgam of many other better films.

crack in the world (1965)

"You'll save the world or destroy it."
Finding himself terminally ill Dr. Stephen Sorenson (Dana Andrews) is determined to push his latest project to fruition; the tapping of the Earth's magma layer for its geothermal energy. But his use of a thermonuclear device threatens to literally split the Earth in two, as he ignores warnings that his theory may lead to disaster.
An early example of the disaster movie, exploiting flawed science to deliver an OK sci-fi.

king solomon's mines (1950)

"...in the end one small pattern emerges from it all, the only certainty: one is born, one lives for a time then one dies, that is all..."
Elizabeth Curtis (Deborah Kerr) wants to find her explorer husband and engages Allan Quartermain (Stewart Granger) to lead an expedition into the uncharted African bush in the attempt. Along the way their prickly relationship develops as they get closer to finding the fabled diamond mines of King Solomon.
A classic version of the adventuring tale.