Water has an allure. Perhaps it is because, from a primordial sense, we came from water and therefore we want to return to water. Exploring the oceans, though, is no easy feat. Snorkelling and diving can only get you so far, but there is always an itch to go further, farther and deeper. To fly through the undersea currents like an oarfish or sink to the inky depths of the Mariana Trench. Well, with these five personal submarines you could try to do just that. Suit up. Let’s dive.