Around the Dead Sea, sinkholes are an increasing peril. Warning signs are posted on the road, but there is little one can do once you get that sinking feeling, it turns out, except wait for rescue. Check out this Associated Press article about the 14-hour unexpected underground trip taken by geologist Eli Raz in Ein Gedi. The photo of tourists rinsing off the curative mud was snapped in the same region, but these fellows were not in any sinkhole, luckily (although it might be argued they belong in one.) Water mis-use in this arid place has led to the creation of thousands of open holes. Still, don't even think about paddling in the Dead sea without a sweetwater splash handy.
Photo by The Age