“What is there to see in a lake?” It’s the most common question we get when we mention a weekend trip to Lake Pleasant. To the uninitiated, it might just look like a desert reservoir, but for a diver, Lake Pleasant is a world of hidden history and surprisingly busy freshwater ecosystems. From the ruins of an old dam to the seasonal appearance of “freshwater jellyfish,” here is exactly what you can expect to see when you descend into our favorite Arizona training site.