A screen image from video of the "zorb" as it began rolling down a mountain in southern Russia last week. One of the two men inside would die from injuries received after it careened into a ravine. YouTube hide caption toggle caption YouTube The Two-Way 'Zorbing' Death Brings Call For Safety Rules; Fatal Ride Captured On Video January 9, 2013 For a little less than $10 each, two tourists paid for a ride down a Russian mountain in an inflatable ball. It went off course, into a ravine and ended up on a frozen lake. One of the men died after his neck was broken. The inventors of the sport want safety rules to be enforced.