The surfing world is mourning the loss of underground big-wave surfer Nathan Bartlett, who died recently while surfing at Jervis Bay in Australia. He was 43 years old. Known quietly within heavy-water circles as a fearless charger with deep ocean knowledge and a no-frills approach to surfing, Bartlett spent decades chasing powerful waves away from the spotlight. Friends and fellow surfers described him as deeply committed to the ocean, someone who preferred the raw experience of surfing over attention or recognition. Longtime big-wave documentarian, Tim Bonython, once captured Bartlett on an undisclosed New South Wales bombie, absolutely sending it. See below. Bartlett’s death has sent shockwaves through Australia’s tight-knit surf community, particularly among those who knew him through years spent surfing remote reefs and dangerous lineups.…