The elevator they're proposing will be, that's what makes it an even more attractive proposition than the usual mountain based ones. It will put it out in the middle of the ocean far away from a potential terrorist/airplane strike and it will be able to manuever the cable to avoid orbital debris. It looks like they've got all of the major conceptual problems worked out. I'm beginning to believe this thing is going to be built within the next thirty years or so.
Space elevator is anchored at ocean-based platform. Concept is getting a serious technical look by engineers and advanced planners.