Finding and observing polar fishes sometimes requires diving in 28 ˚F (-2 ˚C) water through 21 foot (6.5 m)-thick sea ice. With a drysuit, it's not as cold as it looks.

Think it is safe to cross this crack? Paul and Lauren. 
Into the abyss. Paul and Lauren. 
Paul and Lauren prepare for a dive. 

Paul and Lauren prepare for a dive. 

Paul with a frozen diving downline in a chilly 'Apple'.
Katie et al. drilling a dive hole.