undersoil

"We have to say to ourselves that it's time for undersoil heating. We've got to take our game seriously. Yes, we can have our blowers and pitch tents but it's not enough."

From BBC ● Jan. 22, 2023

Chelsea manager Emma Hayes said it was time for stadiums hosting games in women’s soccer to have undersoil heating like in the men’s game.

From Seattle Times ● Jan. 22, 2023

Viewed with an undersoil camera from the side, the Wimbledon grass is divided into sections, the smallest of which is green.

From New York Times ● Jun. 25, 2012

While in the Premier League this season, critical attention has focused on the absence of a £1m undersoil heating system at Blackpool's Bloomfield Road, Topping points to the practical problems faced by the grassroots game.

From The Guardian ● Jan. 22, 2011

Fortunately the undersoil was stiff, the sides of the trenches could be cut quite perpendicular and in fine weather there was slight risk of the under-cutting causing subsidences.

From The Fifth Battalion Highland Light Infantry in the War 1914-1918 by F. L. Morrison