| Last updated
You've probably heard that after many years of war and arguments South Korea and North Korea are finally trying to put their differences aside and enjoy a new, peaceful relationship.
One of the most important things in any talks between the two nations is North Korea's nuclear ambitions. In recent times Kim Jong-un's North Korea have been testing nuclear missiles and engaging in a war of words with other countries like the USA.
These new talks have given everyone a bit of hope that North Korea might stop their race to become a nuclear power - so why the sudden change of direction? Recently Mr Kim had said that they were going to continue their programme.
Well, there could be a bizarre and unexpected reason - a mountain near to the test site that they have been using to explode the missiles could be on the verge of collapse. If it does collapse, it could be in danger of leaking loads of radiation.
The test site - called Punggye-ri - has been involved in six previous explosions but the latest test, which was by far the biggest, is thought to have caused a collapse of the inside of a nearby mountain - Mount Mantap.
Seismologists registered several aftershocks following the last test in September. North Korea surprised everyone by announcing that they were suspending missile tests last Saturday.
Research has been performed by the University of Science and Technology of China (USTC) and is to be published in the American Geophysical Union's journal, Geophysical Research Letters.
A brief summary on the union's website said: "The occurrence of the collapse should deem the underground infrastructure beneath mountain Mantap not be used for any future nuclear tests."
The lead author of the study, Professor Wen Lianxing, told The Wall Street Journal that they won't be publishing a conclusion to the test site's collapse, but he didn't say why they wouldn't be commenting.
Their research did say: "In view of the research finding that the North Korea nuclear test site at Mantapsan has collapsed, it is necessary to continue to monitor any leakage of radioactive materials that may have been caused by the collapse,"
They also found that further testing 'would produce collapses in an even larger scale, creating an environmental catastrophe'.
Last month in the same journal the Jilin Earthquake Agency drew similar conclusions about the mountain. They said that the last explosion had created a cavity and a damaged 'chimney' of rocks above it.
Chinese authorities have said that they have not found any radiation risks just yet from their tests on samples from around the border.
Chosen for YouChosen for You
Most Read StoriesMost Read