Mariner's Armor

[ Armure de marin ]
Armor (light medium or heavy), uncommon
While wearing this armor, you have a swimming speed equal to your walking speed. In addition, whenever you start your turn underwater with 0 hit points, the armor causes you to rise 60 feet toward the surface. The armor is decorated with fish and shell motifs.
Dungeon MasterĀ“s Guide (BR) D&D 5 › Magic Items