Don’t have much to say, a version of fishing where you dive down to get fauna and flora by hand. Similar to how Animal Crossing: New Horizons did it. This could be good for increasing the size of the other marine life part of the collection book. Imagine collecting coral fragments to grow in special equiped aquariums, selling your grown coral for moolah or keeping it to decorate your own tanks, finding deep sea secrets, and lost artifacts, and even being able to spread the message of the destruction of our reefs (obviously not in your face constantly).
Who knows, this could be an amazing addition to the already wonderful fishing in this game. Thanks for listening and considering.