In the worldscape of 1935 there aren't C5 Galaxies and Antonov 225s.
True, though remember this movie takes place some time in the post-1940 future (since Richard Dix had completed the channel tunnel in 1940, and that's a few years in the past). Presumably air transport would be more advanced than in 1935.
But transport undersea would still take several days, not much different than shipping. As to vulnerability, ships have to be located on the sea, often a matter of chance. The tunnel is always in the same place. If an enemy wants to sabotage it, they know where to go. Besides which, an enemy wouldn't have to go down several miles to destroy it. They could wreck it much as you described:
And you don't even have to fill the whole tunnel, at first at least. Place a waterproof seal after the first mile or so, and open the land-facing end to the Ocean. The enemy can go thru most of the tunnel if they want, but they don't dare break the seal and you don't damage thousands of miles of tunnel fixings
Or they could just detonate a concealed bomb midway across the Atlantic. The tunnel would be put out of commission for many years, if not permanently. The point is, a transatlantic tunnel could be easily wrecked. Unlike ships, which can be defended by other ships or planes, the tunnel is nearly impossible to truly defend. Besides, you can always build more ships to replace those that have been sunk. You can't readily rebuild a 3000-mile-long tunnel, and an underwater one to boot. And the loss of cargo, men and supplies in the destruction of the tunnel would be vastly greater and more of a setback than would sinking a couple of supply ships.
Anyway, all this speaks to defense matters. I still don't see how that helps create world peace. It may make the British-American alliance stronger but militarily it's a highly vulnerable target and aside from the six-day movement of men and materiƩl between the two countries it's of little intrinsic value. The tunnel is not a weapon nor is it a deterrent to aggression. From a military point of view it's useless and probably costs more to defend and maintain than any benefit it would yield. At best, it's just a big, dopey structure that's an engineering marvel but changes nothing in the great big world above.
Oh yes,
Battle Beneath the Earth was awful. The kind of film that gives comic books a bad name.
Captive Women, on the other hand, was very cool, albeit cheap. Interesting concept, anyway.
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