I will put in for highest altitude workplace at 4,600 metres (15,000 feet). Collahuasi Mine northern Chile border of Bolivia just south of Peru. Parts of the mine where I would have repeaters to install would be at 5100 metres (16,700 feet).
You pickup a rental truck at the airport at sea level in Iquique and head east for 5 hours and about the 3rd hour mark you wonder why the truck will not get out of 2nd gear when it seems almost flat on the road. Eating lunch at 4,300 metres (14,100 feet) requires you to take long breaths between bites otherwise you get light headed. Mining accommodation is at 3,800 metres (12,500 feet) and they have a high humidity enclosed jungle garden separating the wings, its meant to make it easier to sleep. I would go for 2 weeks stints and have a headache the whole time until I got half way back to sea level.
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