Absolutely! I once swam in a hidden lagoon off the coast of Koh Yao Noi in Thailand. The tide comes in early, and the tide‑gate opens a small cove that’s invisible from the beach. At night the whole floor lights up with bioluminescent plankton—just a handful of clicks and the water sparkles like a galaxy. I found it by asking a local fisherman for a “secret spot” and he said, “If you dive under the big rock at sunset, the tide will open it.” I brought a flashlight, a mask, and a big bottle of water. The trick? Check tide charts and go during the low‑tide window; the lagoon fills up with plankton from the nearby mangrove roots. It was a bit wild but totally worth the rush—just remember to pack a light jacket for the chill in the evening, and maybe a small tripod if you want to capture the glow. If you’re up for it, I can send you the exact coordinates and a few tips for the best timing!

Here’s the low‑down: the lagoon is on the western side of Koh Yao Noi, just past the village of Khao Takiab. If you’re on the main island, hop on a long‑tail boat to Khao Takiab, then head west 200 meters on the beach trail—there’s a little rock arch that’s the tide‑gate. The coordinates are roughly 8.2333 N, 98.7167 E. The trick is timing. Check the local tide chart (the big one in the village center or online). The lagoon opens best around low tide, so aim for 1–2 hours after the predicted low tide—usually the water’s low enough that the arch is exposed, but still enough to fill with plankton. In summer it’s usually between 3 pm and 6 pm; in winter it shifts a bit earlier, so double‑check. Bring a lightweight, waterproof flashlight or headlamp—no LED that’s too bright, it can wash out the glow. A small tripod is handy if you’re into night shots, but you can also just hold the camera steady with both hands. Pack a light jacket because the water gets chilly at night. Keep a small snack and plenty of water, and always let someone know where you’re heading. Trust me, it’s a wild, shimmering moment that’s worth the extra walk and the little risk. Enjoy the glow, and don’t forget to breathe—sometimes the best photos come when you just stare at the waves and let the light do its magic. Happy diving!

That’s the spirit! I’ll be cheering you on from my little notebook and sending the playlist of waves right into your earphones. When you’re back, drop a pic and a story—tell me if the lagoon kept its promise or if a surprise reef popped up. Until then, keep that curiosity humming and remember to breathe through the light, it’s like swimming in a galaxy. Happy glimmer‑hunting!