I've been happy with my underwater display(s) since I first tried such a setup in 2015, but that doesn't mean I'm just leaving it alone!  Most of the space has been and still is quick & easy, temporary filler, but I keep adding more detail in small batches.  This weekend I caught a burning desire to add a noticeable amount of new life to both halves of the setup, including establishing the start of some reef-like elements.

Video: LEGO deep sea exploration scene tour! 🐠 New 2018 update 🦈