They have to drill holes in the ice, dive down into the water -- cold, cold water -- to get hold of the instrument, bring it up, do any repairs and maintenance that they need to do, put it back and get out before the ice melts.
他们必须在冰上钻洞， 跳进水中，极冷极冷的水中， 去找到水中的设备，并且将其取出， 他们需要去完成所有的维护和修养工作， 而且要在冰融化之前将其刚回去，再取出来。