Say you are pushing on the wall in your house.. eventually the strain would make the wall buckle and you go right through (submarine)
Now instead someone else is on the other side of the wall pushing with the same exact force as you. There will be a small amount of compression of the material that makes the wall but largely the 2 forces are now equal and opposite so they cancel each other out (sunken titanic)
That’s not to say that things didn’t buckle as the Titanic went down.. anything that was air tight at the time of the sinking could and probably did either suffer a catastrophic implosion or eventually suffered a breach and also filled with water
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