A topographic map of Greenland from bedrock elevation data.

A topographic map of Greenland from bedrock elevation data.

Credit: J. Bamber, University Bristol

A topographic map of Greenland from bedrock elevation data.

3D view of the subglacial canyon, looking northwest from central Greenland.

3D view of the subglacial canyon, looking northwest from central Greenland.

Credit: J. Bamber, University Bristol

3D view of the subglacial canyon, looking northwest from central Greenland.

3D view of the subglacial canyon, looking to the southeast from the north of Greenland

3D view of the subglacial canyon, looking to the southeast from the north of Greenland

Credit: J. Bamber, University Bristol

3D view of the subglacial canyon, looking to the southeast from the north of Greenland.

3D view of the subglacial canyon, northwest from central Greenland

3D view of the subglacial canyon, northwest from central Greenland

Credit: J. Bamber, University Bristol

3D view of the subglacial canyon, northwest from central Greenland.

3D view of the subglacial canyon, northwest from central Greenland.

3D view of the subglacial canyon, northwest from central Greenland.

Credit: J. Bamber, University Bristol

3D view of the subglacial canyon, northwest from central Greenland.