Purchase College (NY) has tunnels too, but unfortunately only under the classroom buildings and campus centers, not under the dorms (at least not that I ever knew about!). They are very easy to get into (but I'm not telling how!), and look alot more "finished" than the ones you show - no "beaches" or miscellaneous machinary.
Because they were so easy to find there were endless stories about mischief and mayhem in the tunnels, mostly the sort of stories designed to scare folks away (homeless people live there, so-and-so was raped, etc.) none of which were true that I could discover. Honestly, the tunnels were too well-used (by staff, not students) for much to happen. I used the tunnels constantly both as a student and as faculty/staff (sometimes even with permission!) to avoid foul weather, to take short-cuts between buildings when I was late, or occasionally because my job required it.
Always wished I could have found access to the dorms that way. Although come to think of it there probably weren't any connections for safety reasons - don't want strange maintenance workers wandering into the dorms! I only lived on-campus for a very short time anyway, so it wouldn't have mattered. Oh well.