It was a perfect day for kitesurfing, the spectacular white beaches of the Western Australia south coast set against a cloudless sky.
But lurking beneath the cool blue water was a danger French travel blogger Isabelle Fabre almost didn't notice until it was too late.
As she whipped across the shallow water off Fitzgerald River National Park last Sunday she saw a black shape below the surface, but dismissed it as just the shadow of her kite.
"Then I thought it was a dolphin doing a trick, you know when they spring out just in front of you and give you a heart attack," she said.
However, Fabre, 30, soon realised that not only was the menacing shape bigger than her board, it was circling her.