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I found these laser tripewires in Black Mesa, right in front of a ground turret (you can see the turret's laser as well):

enter image description here

What are these for? The turret? I thought they were laser mines, but they don't explode. They can't be damaged. If you walk through them they just beep.

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up vote 3 down vote accepted

What they do is activate the turret. You can see it's laser finder between the two beams there. Before you trip a wire, the turret is inactive, and won't do anything. You can use this to your advantage to avoid them when possible, or to locate the turret for destruction.

Note that damaging the turret also activates it, so ensure you hit it hard enough to destroy it quickly.

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Ah, this became apparent later on in the same area. Curiously the first time you see them it's very hard to tell what they do. Usually they show you how stuff works before they kill you with it – Ben Brocka Oct 25 '12 at 0:13
This is Half Life. It delights in killing you with new things. – Frank Oct 25 '12 at 0:17
@BenBrocka: If memory serves, the original did this almost exactly the same way. – MBraedley Oct 25 '12 at 0:59
@MBraedley I don't recall them having separate tripwires, I could have sworn they were always active – Ben Brocka Oct 25 '12 at 1:19
@BenBrocka: I could be mistaken. I haven't played the original in nearly a decade. – MBraedley Oct 25 '12 at 10:47

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