Five people moved in tandem down a trail, connected by a wheelchair unlike any other.

This hiking trail, popular with Bend, Ore., families, is a testing ground for inventor Geoff Babb. One miscalculation about how to navigate a tight squeeze of boulders, and he could topple over the edge toward an ice-cold river below. But that's not what worried Babb, who hasn't walked since a stroke 14 years ago.

"I don't feel scared on the trail. I trust these guys to figure it out," Babb said, adding that he feels more vulnerable crossing a city street.

On "good" bad days, the shells lie open at the bottom of the river, shimmering in the refracted sunlight. Their insides, pearl white and picked clean of flesh, flicker against the dark riverbed like a beacon, alerting the world above to a problem below.

Updated at 9:58 a.m. ET

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