So what did Cassell achieve? As he feared, what he saw on the way wasn't encouraging: "I saw three Mola mola, four sea lions, about six dolphins, and a huge school of sardines. But I didn't see a single shark—and that breaks my heart. It's absolutely a tragedy." In a way, that proves something that doesn't surprise us. Anyone who has been paying attention knows we are strip-mining the oceans of life. In fact, the scale of the problem, and the radical changes in human culture and economies that are required to reverse the destruction, are almost paralyzing.
But, for me, what Cassell achieved is this: he showed that no matter how bleak the outlook, it is important to keep fighting. Do whatever you can do to spread the word or take action to help save the seas. Sailors more than most have that obligation. You never know what impact it might have in the end. Fight. Don't give up. That's all anyone can do.