We’ve only explored and charted some 5% of the ocean, meaning it’s just as ripe for discovery as the final frontier. But which strikes you as more worthy of the risk?

Both are terrifying in their own way — just look up thalassophobia if you don’t believe us — which is another way of saying that both beckon to the adventurous. And while most of us are likely content to ignore that particular call, a select few would happily answer (even if means going where no man or even fish has gone before).