sub-zero

Dennis's job was to send up meteorological weather balloons and radio the reports to the UK every three hours, which involved firing up a generator in sub-zero conditions.

In particular, firms need to be able to store and transport goods at sub-zero temperatures.

Goalmouth scrambles, furious bust-ups and matches played in sub-zero temperatures: the veteran TV commentator has seen it all.

Underground it's dark, dry and chilly, with temperatures remaining sub-zero all year-round; conditions which Mr Bjerkestrand claims are ideal for keeping the film safe for centuries.

The other 46 were rescued in an operation that lasted almost 60 hours in sub-zero temperatures and concluded on Sunday.