When I was a boy in the late 1960s, undersea exploration was almost as exciting as space travel. The French oceanographer and film-maker Jacques Cousteau, master of the research ship Calypso, was a weekly fixture in the Swedish TV schedule (merely two channels in those days).
Innerspace was one word coined for the dark vastness of the ocean depths, which were supposed to be colonized by man in “the near future”. However, the allure of the deep seas soon faded, partially because most of those ambitions turned out to be beyond the capabilities of available technology.
But the visions have not died fully — the third generation of the Cousteau clan is nowadays at work beneath the ocean with state-of-the art tech: link >>>