Someone driving at work
Someone working from home
Someone all alone in a quiet part of a buidling
Anyone who is fit enough
Anyone who has completed the occasional climber course
Buidling work involving structures is taking place
Maintenance work like tank cleaning takes place
Inspection work like using a cherry picker over water is taking place
All of us
Crack on and mention it to the boss later
Down tools and clear off home
Talk to your fellow workers straight away, if you're still worried leave the job and go straight to your line manager to report.
Here's an interesting quiz for you.