AV: Have you ever witnessed bioluminescence—when light is generated by living creatures—in the water?
RT: The first time was when we rowed across the Atlantic, in 2011. Imagine rowing in total darkness, so dark that you can’t see the horizon and there are stars all around you. The reflection of the stars in the water means you’re rowing in a sphere. As we were rowing, our oars produced little whirlpools of bioluminescence. Then we noticed tuna chasing smaller fish under our boat; imagine the shape of a tuna, but somebody’s put really small Christmas lights all over it.
HT: The other time was in Lyme Bay, in the English Channel. We had just completed a sailing project to the center point of the Atlantic to do a plastic survey and we were finishing off with a tour around the UK. We were sailing across Lyme Bay just before midnight and it was suddenly like we were in a Second World War movie: Straight off the beam of the boat were these underwater torpedoes . . . that were dolphins. The water was dark and they were disturbing the phosphorescence. That was one of the most incredible interactions I’ve had with water.
AV: Is it possible to make sense of the ocean’s enormity when you’re rowing across it?
HT: No, there’s nothing—no human references, other than a ship. You can’t reference the scale of anything; therefore, it’s very disconnected. You don’t really feel like you’re on the planet.
AV: Does the water change?
RT: There are definitely different types of water. So the English Channel is a turquoise sea green. And then I think we must have sailed across this imaginary line, where this green coastal water that we find around the UK suddenly goes into what’s called a Caribbean blue, that bright vivid blue. You can tell how far you are off land by the color of the water.
AV: How do you deal with a 40-foot wave?
RT: Forty feet might seem a lot on land but at sea the fetch—or the distance between the top of two waves—could be 200, 300 meters.
HT: You’re essentially a champagne cork just floating on the ocean: Most waves don’t break on you. The top of the crest might, and they do quite regularly. But that’s the top five feet.
RT: Ocean swells can be scary and beautiful, though. You’ll be slowly rising to the top of what seems like a small hill, and you can see for miles, and then you’re dropped down into it, and you really appreciate that drop. Rogue waves are more unpredictable: They can be double the height of a normal wave, and coming from a different direction. You can’t really deal with them, you just have to suck it up.