It can be quite hard to find out detailed information about the history of Koh Tao, but if you do dig around, you can find some fairly consistent stories of how if came to be the place it is today.
The history of Koh Tao backdates to the 1800’s
It was likely a stopping off point for Malay fishermen for centuries, due largely to its isolated position in the Gulf of Thailand. In the 1800s, there would have been a couple of small villages, while later on in the 1890’s King Chulalongkorn visited the island – which is marked with a monument on Sairee beach. The island remained a quiet place for decades, with a few fishing families and farmers and not much else.
A Political Prison
After the Siamese Revolution of 1932, the country moved from being an absolute monarchy to a constitutional democracy (of sorts). Koh Tao was used as a political prison in a similar way to Koh Tarutao in the South. In 1947, the prisoner inhabitants were given a Royal pardon and shipped off out of exile to the neighboring islands of Koh Phangan and Koh Samui. The island was once again abandoned.
The first settlers
The legend then goes that two brothers from Koh Phangan sailed to Koh Tao and settled on the land that is now considered Sairee beach. They farmed and fished and lead a fairly simple lifestyle occasionally trading with those on Koh Phangan.
The Vietnam war came about, which created a tourism boom in Thailand during the 1960s and 1970s for American GIs on R&R. Early backpackers began to explore the Islands in the gulf of Thailand, with dive trips originating from Koh Samui and Koh Phangan. The first full moon party being held on Phangan in the late 1980s. Gradually tourism began to increase on the Islands, and the island began to become more and more developed.
The first Divers
One of the first pioneers at this time was an Italian man who would bring divers from Koh Samui for an overnight diving safari to Koh Tao. He founded Red Rock, White Rock & Green Rock named them after the colors of the Italian flag, & became the first dive shop on Koh Tao as well as on Koh Samui. Then one day in 1990 a tall Swede started his Open Water Dive Course. He liked it & did some more courses, and within the year had opened for himself the second dive shop on Koh Tao- Big Blue Diving. Koh Tao was now truly open for business.