Alright, so Starfleet has ships of in various regions of space doing various things. We often see these ships exploring new planets, but the only fullsized Federation starship (as in, not a shuttle) I've seen that can land on one of these planets is the Intrepid class (Voyager). This is obviously an inconvenience, we've seen several times this isn't necessary but it would be nice. There is an even bigger problem, what about worlds with oceans? think of all the life, and possible archaeological discoveries hidden within the depths. There is still much to be discovered in our own oceans, imagine what we could find on alien worlds? We've seen the Delta Flyer be modified for such an environment but.... I have to ask why we've never seen a ship designed this purpose that is of Federation design. And what about the tactical advantage you'd have? I've been thinking about this for a long time but surely I'm not the first to do so. So where can I find these concepts?