Hitman 2 Last Resort | 3 targets at once

How to take out all three targets at once in the Hitman 2 "Last Resort" mission:
Get in the basement and trigger a complete server shutdown. You'll need to take out some techs first, to prevent them from fixing it too quickly. Then just plant some kind of explosive near the terminal where they'll all be standing to fix it. The hidden micro explosive isn't powerful enough to take out all three targets, so you can use a propane flask to boost the explosion. Alternatively, I suppose you could just throw a grenade from a hidden position. No "silent assassin" award, obviously, because their bodies are very much found. xD