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what Baraka said, Roach. There are corridors where subs like to go due to ease of navigation, or predictable and good thermal layers (which help keep subs hidden), or proximity to somewhere the sub is supposed to be hitting.
Also, esp. with US and Russian subs, we each know where the other country's subs like to hang out. If you were running the US submarine fleet, and you knew that Russia liked to park a nuclear missile-armed boomer in a certain place, wouldn't you send your hunter submarines over there to watch for it? So really, it's not at all surprising that submarines from different countries wind up in the same general area and that, from time to time, they run into each other.
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