Booked this last minute with a small group of friends and it turned into a very pleasant surprise. The whole route feels like a quiet world tour under water, moving from the Black Sea section to the Pacific areas, with different sounds and lighting in each zone. We spent a long time just watching the sharks glide overhead and the gentoo penguins hopping around on the rocks. The Amazon rainforest part is also impressive, with warm, humid air and dense plants that make you forget you are indoors. Only minor issue: a short queue formed at one of the tunnels, but it moved reasonably fast. Shuttle from the hotel was on time and made the day very easy in the summer heat.