Antarctica has hit a record-breaking temperature of 18.3C – but experts have warned the soaring mercury could spark a wave of tourist catastrophes.
Ice cap tourism is booming with 50,000 people visiting last summer.
But experts warned the climate change could increase the risk of icebergs breaking off and hitting vessels like the incident which led to the sinking of the Titanic in 1912.
Professor Klaus Dodds, a geopolitics expert at Royal Holloway, University of London, said only the most experienced captains should attempt to navigate the ice fields to avoid a repeat of the catastrophe.
And he hoped trips would be restricted to smaller vessels.
He said: "If you have a disaster in Antarctica it has every potential to become a disaster of unedifying proportions."
He added that he "wouldn't want it being one of those 1,000-passenger cruise ships if it strikes an iceberg".
More than 1,500 people died when the passenger liner Titanic hit an iceberg on its maiden voyage from Southampton to New York in 1912.
The new temperature record beats the previous one of 17.5C by 0.8C.
It was recorded on the earth's southernmost continent in March 2015.
Argentine weather research station Esperanza collected the data.
Professor James Renwick, a climate scientist at Victoria University of Wellington, said: "The reading is impressive as it's only five years since the previous record was set and this is almost one degree centigrade higher.
"It's a sign of the warming that has been happening there that's much faster than the global average.
"To have a new record set that quickly is surprising but who knows how long that will last?
"Possibly not that long at all."
The Antarctic Peninsula, the north-west tip near South America, is among the fastest warming regions on earth.
Temperatures are rising almost 3C over the past 50 years, the United Nations's World Meteorological Organisation said.
Some 87% of the glaciers along its west coast have "retreated" over those five decades.
Esperanza, located near the northern tip of the Peninsula, has been collecting data since 1961.