Building electricity generators underwater is challenging. If a big storm comes through, the storm surge will destroy almost everything in its path. You design

Building electricity generators underwater is challenging. If a big storm comes through, the storm surge will destroy almost everything in its path. You design a hydropower station so that it will have resistance when the water passes over it, if you don't have the ability to disengage (wind turbines have locks and newer ones have adjustable blades) it will get destroyed when large waves come in (sometimes, all that power is a bad thing). It's great that we're still attempting these though, the power of the sea is too tempting to stay away from. Whether or not it works, it will give us another data point on what to try, or what not to try.