My complaint is simply that they're claiming a record by making their own cave -- but miners already do that, and have thereby surpassed this record by 1500 meters.
It's the spelunking equivalent of steroids....
The cave existed, but choke points get clogged with rubble. The rubble needs to be blasted out from the pre-existing cave.
Similarly, use of Drano does not constitute drain pipe manufacturing.
Just pulling your chain r9....sorry, ;). IIRC, spelunkers of old were not allowed to blow their way through millions of years of history just to set records, apparently times have changed.