Hitherto, for the last few days, the thermometer had been registering an average of about 6 degrees below zero, and it had become matter of experience that the stove, although replenished with all the wood that was available, was altogether inadequate to effect any sensible mitigation of the severity of the cold.

Nor could any amount of fuel be enough.

It was certain that ere long the very mercury and spirit in the thermometers would be congealed.

Some other resort must assuredly be soon found, or they must perish.

That was clear.
The idea of betaking themselves to the _Dobryna_ and _Hansa_ could not for a moment be seriously entertained; not only did the structure of the vessels make them utterly insufficient to give substantial shelter, but they were totally unfitted to be trusted as to their stability when exposed to the enormous pressure of the accumulated ice.
Neither Servadac, nor the count, nor Lieutenant Procope were men to be easily disheartened, but it could not be concealed that they felt themselves in circumstances by which they were equally harassed and perplexed.