We used the NERC equipment pool ground penetrating radar (at 50MHz) to map out the glacier bed.
Daniel, Dave and Sue spent most of a week doing radar work. Here you see Daniel's amazing sledge used to hold the 50MHz antennas, plus a lot of fibre cables.
Here Sue is looking after the console and laptop, held in a (rather fragile) plastic box. The equipment was extremely unreliable until we openned it up and fixed some very loose connectors and boards!