The journey is only possible in winter when the Strait freezes over to become an ice bridge.
But the daring pair only managed to dip their toes into Russia as officials refused to let them cross the border.
The British Ice Challenge Expedition got as far as the international dateline before being turned back.
It took five years to build and is called Snowbird 6.
Due to bad weather the two explorers will now be flown back to their base in America.
Snowbird 6 will be left in the cold till the weather improves and it can be brought home safely.