South Korea will host the Winter Olympics this week amid renewed hope for peace on the Korean peninsula after the North agreed to take part under a united flag.
But that has not stopped the country from preparing for the worst, including terror attacks, drone strikes, hostage situations and all-out war.
Korean officials have spent the last few weeks drilling the 60,000-strong security team, which includes 50,000 soldiers, for every eventuality.
South Korea is deploying 60,000 security personnel to guard the Winter Olympics which begin in Pyeongchang on Friday, including 50,000 soldiers
Scenarios they have been training for include terrorists attempting to drive a bus into an Olympic stadium (pictured) after taking athletes hostage
One scenario rehearsed features terrorists who have taken athletes hostage and are about to ram a bus into an Olympic venue, CBS reports.
Others include a chemical bomb exploding inside a bin and a drone laden with explosives that has been shot out of the sky.
South Korean marines have also been training with their American counterparts, including the skills needed to fight in a mountainous environment in cold weather.
Meanwhile the US and South Korea canceled large-scale military drills planned for March and April to avoid the risk of angering the North.
As a condition of North Korea participating in the games, Kim Jong Un has agreed to send a high-level delegation to the event, which will include the country’s ‘ceremonial leader’ Kim Yong Nam.
Another drill imagined that a chemical bomb had been set off in a bin as panicked spectators fled for their lives
It is hoped that North Korea’s participation in the games, and the fact that they are sending a high-level delegation, will lower the chance of a weapons test during the event (pictured, a North Korean flag flying in Pyeongchang)
US Marines have also been training with their South Korea counterparts to prepare for cold-weather war in the mountains around the Olympics site
It is hoped that this will reduce the likelihood of a nuclear test or missile launch during the games, and will provide the opportunity for more talks between the South and North after communications were suddenly established last month.
There is also the prospect of direct talks between Washington and Pyongyang because US Vice President Mike Pence will also attend the games.
Aside from the threat of weapons tests and war, the North is well-known for its cyber warfare capabilities, and was widely believed to have been behind the WannaCry virus that crippled computers around the world last year.
To combat this, South Korea has contracted an outside company to provide internet security.
South Korea’s government has also reportedly has banned 36,000 foreigners from entering the country for the Winter Olympics, because of security issues.