At one o'clock and after a quick lunch eaten on the boat we're back in the channel and sail over the pipeline bringing in the offshore gas. It's down about ten metres, covered in rocks for protection, and there's actually a guy anchored illegally on it with a line in the water. “Good fishing along the pipeline,” says the skipper with a grin. On the way back to the Dampier docks, we stop at Dolphin Island where everyone else hops off for a look at the five graves there. According to the official report, the skulls are European or Asian, not Aboriginal, but it's a reminder that humans out here during the 19th and early 20th century died at a high rate from causes ranging from genocide to simple infections.