How do the sea nomads hold their breath for extended periods of time while diving underwater?

Sea nomads, also known as the Bajau people, have developed a genetic adaptation that allows them to hold their breath for longer periods of time while diving underwater. This adaptation includes larger spleens, which help store more oxygen-rich blood, and changes in their diving reflex, which slows down their heart rate and conserves oxygen. These biological traits enable the sea nomads to dive and hunt underwater for extended periods without needing to come up for air as frequently as others.