These wells lead into chambers and tunnels by which sooner or later their waters find way to the rock floor of the valley and there unite in a Subglacial stream.
"The Elements of Geology"
William Harmon Norton
The streams which drain the glacier have cut their courses in englacial and Subglacial tunnels; none flow for any distance on the surface.
"The Elements of Geology"
William Harmon Norton
Subglacial streams, like those of the Malaspina glacier, issued from tunnels in the ice, and water ran along the melting ice front as it is seen to do about the glacier tongues of Greenland.
"The Elements of Geology"
William Harmon Norton