Let's dive
The Bajau people are the first tribe in the world to have evolved to adapt to life under the sea. They spend their entire lives living on the sea and searching for food on the ocean floor. They live in temporary stilt houses and on their boats, scattered throughout the seas of Indonesia, Malaysia, and the Philippines. They have lived this way for over 1000 years, and their food is entirely dependnt on the surounding seafood. This forces them to work underwater all day to catch shrimp, crab, fish, and squid.
Therefore, the Bajau puncture their eardrums to balance the pressure between the outer ear and middle ear, helping them avoid discomfort when diving deep underwater. However, puncturing the eardrum can also reduce their hearing ability and make them susceptible to ear infections. This is a trade-off that the Bajau must accept in order to live underwater.
What is extremely unusual is that they can dive for over 13 minutes at a depth of 60m below the ocean floor. Why can they do this? It turns out that they have a much larger spleen than normal people. It has the abilty to pump more oxygen into the blood and works no differently than a biological scuba tank. Their spleen has a volume greater than normal people by more than 50 percent.
What is special is that this feature is not only found in divers but also in other members of the tribe, including children who have never dived before. This means that they have evolved to live more easily under the sea."
📸 A Sama-Bajau fisherman swims to the surface with an octopus caught in the Banda Sea in Sulawesi, Indonesia. Credit: James Morgan
The Bajau tribe, often referred to as 'sea nomads', has a rich cultural heritage intertwined with the ocean. Their ability to dive for extended periods at impressive depths not only demonstrates their physical prowess but also showcases their deep connection with marine life. The importance of seafood in their diet drives them to develop exceptional skills, enabling them to catch various sea creatures such as octopus, shrimp, and squid. Studies indicate that their larger spleen provides a significant advantage during dives, allowing for more effective oxygen delivery throughout their bodies. This physiological adaptation, coupled with traditional diving techniques taught from a young age, ensures the survival of their community in a challenging environment. Though puncturing their eardrums may seem radical, it is a testament to the lengths they go to endure their unique lifestyle. Conservation efforts in the region are vital as the Bajau people depend on the health of marine ecosystems, which are threatened by overfishing and environmental changes. Preserving their culture and the biodiversity of the seas presents a challenging but necessary objective for future generations. Understanding the Bajau's way of life not only informs us about human adaptability but also highlights the importance of ocean conservation.
