Antarctica

Antarctica is a continent of rock buried under an ice sheet that averages about 1.9 km thick and reaches 4.8 km in places. The ice holds roughly 70 per cent of the world's fresh water and flows slowly outwards to the coast, where it breaks off as icebergs or spreads over the sea as ice shelves. What most visitors see is the Antarctic Peninsula, a mountainous arm reaching north towards South America, with glaciers pouring into narrow channels and bays.

The interior is a polar desert: very cold, very dry and windy, with the lowest temperature ever measured on Earth, −89.2 °C at Vostok in 1983. The Peninsula coast is far milder. In the tourist summer from November to March, daytime temperatures near the shore usually sit between about −5 °C and +5 °C, but wind can make it feel much colder, and weather changes within an hour.

Sea ice sets the calendar. In winter it doubles the continent's size and blocks the coast; each spring it breaks up and retreats south. In November ships may find bays still frozen and landings blocked; by January most channels are open. The Ross Sea opens only briefly in January and February, which is why voyages there are so few.

Daylight swings to extremes. Near the Antarctic Circle in late December the sun barely sets, and the light is available for landings at almost any hour; by March nights return quickly. Ultraviolet levels are high, especially under the seasonal ozone hole in spring, and snow reflects most of it back at you.

The Peninsula is also one of the fastest-warming places on the planet. Researchers track changes in sea ice, glaciers and penguin populations, and several expedition ships now carry citizen-science programmes — cloud observations, phytoplankton sampling, whale photo-identification — that passengers can join.

Seven countries claim slices of Antarctica — Argentina, Australia, Chile, France, New Zealand, Norway and the United Kingdom — and the British, Argentine and Chilean claims overlap on the Peninsula. The Antarctic Treaty, signed in Washington in 1959 by twelve countries and in force since 1961, froze those claims: nobody can make new ones, and nobody has to give theirs up. The continent south of 60° S is reserved for peace and science, military activity is banned, and any party can inspect any station.

The Treaty has since grown to more than fifty parties and a set of related agreements. The most important for visitors is the 1991 Protocol on Environmental Protection, the Madrid Protocol, which bans mining, requires environmental impact assessments for all activities, protects wildlife and historic sites, and controls waste. Under it, each country must authorise or be notified of the expeditions organised from its territory.

In practice that is why you never apply for a visa. A voyage run by a company based in the United States is notified to the US Environmental Protection Agency; a British operator's voyage is permitted by the UK Foreign Office's Polar Regions Department; Australian, New Zealand, German, French and Norwegian operators go through their own national authorities. The operator handles it for passengers. People sailing their own yacht or organising a private expedition must apply to their government themselves, and some require months of lead time.

Tourism is managed mainly by self-regulation through IAATO, the International Association of Antarctica Tour Operators, founded in 1991. Its rules — ships of more than 500 passengers may not land people, no more than 100 people ashore at a site at once, one ship at a site at a time, site-specific guidelines agreed at Treaty meetings — are what shape the day on board. Treaty parties have discussed tighter limits as numbers grow; check whether new rules apply to your season.

The continent was first sighted in 1820 by Russian, British and American expeditions within months of each other, and sealers followed at once, nearly wiping out fur seals on the sub-Antarctic islands by the 1830s. The 'heroic age' of exploration ran from the 1890s to the early 1920s. Belgian, British, Norwegian, Australian, Japanese and German expeditions wintered on the ice, mapped coasts and raced for the South Pole.

Roald Amundsen's Norwegian party reached the Pole on 14 December 1911 using dogs and skis; Robert Falcon Scott's British team arrived on 17 January 1912 and died on the return. Their huts at Cape Evans and Cape Royds on Ross Island, and Shackleton's hut at Cape Royds, are preserved with their stores and can be visited on Ross Sea voyages. Douglas Mawson's Australasian expedition left huts at Cape Denison, the windiest place at sea level on Earth.

Ernest Shackleton's Endurance expedition (1914–17) is the story visitors hear most. The ship was crushed by Weddell Sea ice; the crew drifted on floes, reached Elephant Island in lifeboats, and Shackleton sailed 1,300 km to South Georgia in a small boat before crossing its mountains to the whaling station at Stromness. Everyone survived. His grave is at Grytviken, where voyages stop and passengers raise a toast; the wreck of Endurance was found in 2022 at 3,000 m and is now a protected monument.

Industrial whaling followed from 1904, based at South Georgia and on factory ships, and killed well over a million whales before it collapsed in the 1960s. The abandoned stations at Grytviken, Stromness and Deception Island's Whalers Bay are now visitor sites. After the International Geophysical Year of 1957–58, science became the main activity: about 70 stations now operate, some all year, and Port Lockroy, a restored British base, runs a small museum and post office in summer.

Antarctica's wildlife lives off the sea. Krill, small shrimp-like crustaceans that swarm in the cold, nutrient-rich water, feed penguins, seals, seabirds and the great whales, and the summer pulse of light drives it all. Almost every animal you see is breeding, moulting or feeding hard before winter, which is why the month you travel changes what you watch.

November is the start of the season. Gentoo, Adélie and chinstrap penguins return to their colonies, court and build nests of stones, which they steal from each other. Snow is still clean and deep, icebergs are plentiful and sea ice may still cover bays. December brings eggs and, towards the end of the month, the first chicks; days are longest. January is peak chick time, when colonies are noisy, busy and at their most photogenic.

February and March are for whales. Humpbacks and minke whales feed in the Gerlache Strait and Wilhelmina Bay, sometimes in dozens; orcas are sighted more often late in the season. Penguin chicks gather in crèches and start to moult into adult plumage, and fur seals arrive on the Peninsula beaches. Colonies are muddier and smellier, and some voyages push south of the Antarctic Circle as the ice allows.

South Georgia runs on its own calendar. Elephant seal bulls fight for harems on the beaches in October and November; pups are born and weaned by December. Fur seal pups fill the beaches in December and January, and the huge king penguin colonies at Salisbury Plain, St Andrews Bay and Gold Harbour always have both chicks and adults, because king penguins take more than a year to raise a chick. Wandering albatrosses nest on Prion Island.

Emperor penguins, the ones on posters, breed in winter on sea ice far from the Peninsula routes. A few specialist voyages to the Weddell Sea (Snow Hill Island) and private flights from Cape Town or Punta Arenas try to reach them in November; success depends on ice. Since 2023–24 H5N1 avian influenza has reached Antarctic wildlife, and operators may close sites or add distance rules at short notice.

An expedition ship is a floating base, not a cruise liner. Most carry 100 to 300 passengers, an expedition team of naturalists, historians and guides, a doctor and a fleet of inflatable zodiacs. After embarkation in Ushuaia the ship sails down the Beagle Channel and out into the Drake Passage, about two days of open sea with lectures, safety drills and the mandatory biosecurity session, where you vacuum your bags and clothing.

Once in Antarctic waters the day is built around landings. The expedition leader and captain choose sites each morning from a list agreed through IAATO, depending on wind, swell and ice, and plans often change at short notice. Groups rotate ashore for an hour or two along routes marked with flags, then may switch to a zodiac cruise among icebergs. Boots are scrubbed in disinfectant every time you go ashore and come back.

Seasickness is the most common complaint. The Drake can be calm ('Drake Lake') or bring waves of 5–10 m ('Drake Shake'); ships have stabilisers but still roll. Start medication before you leave the Beagle Channel, choose a cabin low and near the middle of the ship if you are prone to it, and rest. A fly-cruise avoids the crossing but depends on flights to King George Island, which wait for clear weather.

Plan the money side carefully. Cabins sell out 12–18 months ahead for December and January, deposits are large, and balances fall due three to four months before departure. Insurance must name evacuation from Antarctica — operators often specify a minimum amount. Extras such as kayaking or camping sell out at booking. On the last evening most ships collect crew tips, and many now include some internet access by satellite, though it is rarely fast.