- last post: 01.01.0001 12:00 AM PDT
It wouldn't work in the Halo world, as I said they would've discovered it. They have sensors that can work at interplanetary ranges, detecting something near the surface of the ocean would be easy.
Also, the banner at the top of the page for The Library forum makes it plain that the Halos target sentient life specifically, they are not a big explosion.
In the part where Cortana Slipspace jumps to Reach in First Strike, she finds out that teleporting something into matter would just push the matter aside. This means that teleporting the Halos inside the Earth would work, although I do not believe that is what they did. In fact, that might've been put in just to let us figure out that is how the Forerunners built those facilities.
[Edited on 5/13/2006]