MSNBC Dateline March 22, 2021 07:16:00
>> yeah. ive seen those in real life. >> reporter: these are the most dangerous shafts to search, vertical ones that go straight down into a crumbling abyss. >> originally we were dropping mine shafts. we were physically going down the shaft. we would rig the ropes, rappel in, check it, clear it. and move on. but it became not feasible with the amount of mines we had to search. >> reporter: so they outfitted buckets with cameras. it sped up the process, to be sure, but with hundreds of mines to ...
Construction Worker Construction Equipment Public Space Outdoor Play Equipment Belay Device Rock Climbing
Source: archive.org