>> the men have little food but water is abundant. thousands of gallons of greasy murky water is stored in the mine to keep machine engines cool. it's drinkable, which is critical at 100 degrees fahrenheit and 100% humidity. jorge galleguillos has high blood pressure and lung problems caused by years of mining. the heat is making it worse. >> your entire body is sweating and you get an ache in your foot. the boot. you want to cut it to let it breathe. miner alex vega is also suffering. the 31-year-old machine mechanic says his ulcer is paralyzing him with pain. >> so you had three pills yet. >> translator: i had to divide three pills into four parts and take a piece per day.