What I think happened is both subs were given a overlapping patrol areas, both skippers looked for the best hidey-hole they could find, then one hears the other or they hear each other and since there mission is basically "Don't get found" they both go quite and vanish from sonar, they drift and then all of a sudden BANG they drift into each other.
As for objects in space; you have a large amount of objects traveling at great speed in all kinds of directions in orbit. You also have stuff ie meteors coming down regularly. well lets put it this way I am surprised it took so long for something to collide.
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