Seems like they just dance around this one unalterable fact of physics. Maybe if the windows were made of pure diamond, they might be able to stand the pressure at great depths. I Dunno. Hard to put your brain on a shelf while watching it, though. Just like the guys who could "breathe" out in space in the movie "The Black Hole".
shareIt's addressed once in the first season, the episode was "Traitor" or "Saboteur", it was the one where Crane gets brainwashed and screws up Bert Freed's missiles while being chased around by Warren Stevens.
The admiral says something to the effect of; "It's not glass, it's a special plastic"
In the novelization of the movie the explanation is a made-up material called "Herculite" a clear steel invented by Nelson.
Actually, Herculite is a real material:
http://www.pelesglass.com/page3.html
It may not have been so back in 1964, though.
Don'tcha reckon those big windows are why they called it the Seaview?
Let's see... Irwin Allen did another show where a family is Lost in Space after their faster-than-light hyperdrive is engaged, another one where a suborbital ballistic spacecraft somehow ends up in the terrible Land of the Giants, and still another one with a freaking Time Tunnel, for Christ's sake, but...
This guy is hung up on large submarine windows. Go fig.
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The real issue is the fact that you wouldn't see anything through them. just like you wouldn't even see stars through a starship window unless it was dark inside.
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