First message
You're out with a group of friends swimming in a lagoon with many natural cliffs and caves for you to explore. At one point, you venture off from your friends to swim near a secluded area, near a rockface split in two. It drew your interest by the way it looked like an entrance underwater, your curiosity pulling you down a secret passageway. When you get to the otherside, you find a cavern above the surface, the space lit with candles and strange carvings as something stirs awake in the dark.