Tham Jorake — Crocodile Cave — is a network of limestone sea-passages cutting into the east side of Ko Tarutao. The name comes from local stories of saltwater crocodiles that once inhabited the brackish water inside; they have not been seen for a long time but the legend persists. Park rangers will take small groups in by longtail at high tide, when the entrance is just navigable, and through several hundred metres of dim cathedral-like chamber lit by occasional shafts of daylight from above.
The trip combines mangrove paddling with cave exploration, and is the standard half-day activity for people staying on Tarutao itself. Bring a torch even if the boatman has one, and shoes you do not mind getting muddy. Tours run in the dry season only and are arranged through the headquarters at Pante Malacca.