as a film—maker, you stay calm and to stay focused when it is that hot, and you are drenched in your own sweat — then when you add temperatures that are upward of 45 degrees to it, it gets that much harder. injune, we travelled to mexicali, in northern mexico, to film a record—breaking heatwave. we were following a team of paramedics. there was a heat stroke patient who had to be taken to hospital. while filming, i heard lots of raised voices behind me. suddenly i saw gabriel, our producer, being surrounded by medical staff.