This will make a big boom:

The test, named “Divine Strake,” will involve nearly 40 times the amount of commercial ammonium nitrate and fuel oil explosive set off in the largest open-air, non-nuclear blast at the site to date. In 2002, 18 tons of explosives were set off at the Nevada Test Site.

700 tons of explosives. This isn’t a weapons test–there’d be no way to deliver that size of ordnance. I’ve got to think that they’re trying to figure out just how small they can size a nuke to (pardon the inadvertent alliteration) bust a bomb-building bunker.