The seas are very rough near Antarctica and there are many sheets of ice and glaciers which host potential danger in fear of crashing.
You may be thinking of icebergs.
icebergs
Ice bergs.
Ice bergs.
what sits on the water and warns ships of the danger coast
what sits on the water and warns ships of the danger coast
what sits on the water and warns ships of the danger coast
2007-2008 was, to date, the peak season for people travelling to Antractica. In that time, Antarctica received 47,225 visitors. Restrictions on large ships, due to possibilities of fuel spillages, have caused numbers to fall since then.
People get to Antarctica on ships or by air. Commercially, however, only cruise ships carry tourists and travelers. You could charter an airplane to take you there, but there are no accommodations and no re-fueling stations for your aircraft. In order to get to Antarctica otherwise, one must have a job, working for a government in support of science.
The most potentially fatal danger was that Colombus and his crews on the three exploration ships furnished by the Spanish Crown would be victims of the Atlantic Ocean. Colombus had never attempted such a long voyage. They were in fact travelling into "uncharted waters".
Antarctica was the last continent on earth to be discovered, because discovery transport was based on sea-going ships which could not survive a collision with an iceberg.
Supply ships generally go to Antarctica when the sea ice melts on the Southern Ocean, so that the supply ships can get to Antarctic ports. This season is usually October or November.