What is life like living underwater?

At first, the brilliance of all the colors was my favorite part. The amount of variety under the water is breathtaking. I love that what I see every day changes; it's based upon what is swimming by. However, I long for a hike up into elevation. Hearing the sound of gravel crunch beneath my hiking boots is no longer available. You also lose any semblance of the four seasons. One day blurs with the next and the next. It's always a comfortable temperature, but after some time, that gets old too.