Koh Tao is an island in Thailand known for having the most diverse and abundant coral reefs in the Gulf of Thailand. However, the coral reefs of Koh Tao, like other reef systems in the world, are threatened by relentless climate change and ocean acidification. Annika Anandsongkit relays her volunteer work in Koh Tao building artificial reefs to combat ocean acidification and preserve reef biodiversity.