Here's a good one from the link Spotshooter posted.
It seems to me like they're blowing away the "bedrock" with just a firehose or ...
Maybe they're just cleaning it up a bit.
They're prepping it for an acid wash, and some gunnite, prior to starting a big pour.
Man, the shots of those boys cad welding that humongous rebar brings back a memory or two. No masks, ....get er' done and have a smoke,....kaff, kaff, kaff,...
Member, Clan of the Border Rats -- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain