Subterranean Attack Wave

Tyranids strike from below and employs a large number of tunnelling organisms. The Hive fleet upon its Vanguard and primary wave's arrival will be to dig deep into the surface of the planet. Where the defenders of a world expect a frontal assault head on within hours of the Hive Fleets arrival instead they are greeted by silence before the earth shattering roar of the earthen crust breaking beneath their feet and a rising tide of tyranid organisms quickly smothering them and dragging them down into the honeycombed maze below the surface that the creatures of fleet use to strike across the planet unseen.