Heat flared: the roaring earth warmed up. Sandry could smell her friends' sweat. Watching Tris shove a wave of settling earth so it yanked the fresh heat away from them, Sandry grabbed a drift of warmth for herself and let her spindle drive it deep into the earth. Tris herded still more heat ahead of her until it burst through pinholes at the bottom of the sea, fueling plumes of steam.