This map takes survival Minecraft and flips it upside down. You can easily move and breath underwater, however you die and your ability to move is decreased on land. However with the right foods you can grant your self immunity to dying on land. This map is great and provides a new experience to both new and old players. It is fun and adds a challenge for players that are looking for one. Plus with the new water mechanics of 1.13 you can build and live completely underwater allowing for more creativity for everyone. Whatever you enjoy this map can provide, have fun!
Foods that allow you to survive above water in order by duration:
Dried Kelp
Cooked Salmon
Cookie
Golden Apple
This list may be updated.