Luckily, my casual 'she'll-be-right-mate' approach seems to be working pretty well so far. I felt quite seasick on Friday - three bites into dinner, I realised that I'd been a bit ambitious in filling my plate - but today my stomach seems to be getting its sea-legs, and I think I'll be ok.

Now we are all looking forward to finding bottom trawling vessels, to show the world the catastrophic impact they have. Out in international waters, these vessels can do pretty much whatever they want and they are destroying whole worlds in their quest for orange roughy and other deep sea fish.

It's hard to imagine the environment a fish came from when it's sitting on your plate or in the fish market - even scientists know very little about life in the deep sea. But the life we do know about is astounding - thousands-of-years-old coral reef forests, glow-in-the-dark sponges, bundles of legs called basket stars and schools of deep sea fish like orange roughy, which are gathering now to spawn above underwater mountains thousands of metres below the surface.

It's while orange roughy are spawning that bottom trawlers target them, scooping up entire shoals and the ocean floor below them at the same time. The weighted nets destroy nearly everything in their paths - who knows what wonders are lost every time a trawler goes across the deep sea floor?

I feel especially privileged to be out on this voyage in the lead-up to the 20th anniversary of the bombing of the first Rainbow Warrior. Sadly, that tragedy helped to make the Warrior perhaps the most famous ship on the surface of the ocean. To be out on the second Rainbow Warrior here today is a solemn thing for me - in the last 20 years ,the environmental problems the earth faces have increased. But it is inspiring to know that the Rainbow Warrior, groups like Greenpeace and concerned people around the world are still working to make governments and industry listen and act towards making a sustainable future.

The beautiful creatures of the deep sea have no voice of their own, so it's up to people like you reading at home, and us, out here, to make sure they are protected.

- Erin