US scientists drill into lake deep under Antarctic ice sheet

American scientists drilled into the Ross Ice Shelf to explore a subglacial lake. They used a sterilized hot water drill, heated to 90°C, and ultraviolet lamps to prevent contamination. The borehole pressure was managed to avoid drilling water entering the lake. Contrary to predictions, the lake was found to be only 5-6 feet deep, with sediment filling the original 30-foot depth.

What was the purpose of drilling 800 meters into the lake under the Ross Ice Shelf?

What measures were taken to prevent contamination from outside bacteria during the drilling process?

Describe the process used to sterilize the heated water before it was used for drilling.

What happened to the pressure in the borehole when the drill pierced the lake?

What was the initial prediction about the depth of the lake, and what was the actual depth discovered?