The Navy’s combat divers, like the commandos, are among the Singapore Armed Forces’ toughest servicemen. Only the fittest are picked for a chance at this elite military vocation, and not everyone survives the rigorous training regime that pushes their physical and mental endurance to the limit. Photojournalists Alphonsus Chern and Caroline Chia tracked a batch of trainees through their six-month journey to become combat divers, watched as many dropped out along the way and had a ringside view of the toughest five days of every trainee’s life, Hell Week.