To breathe under water, we must learn how to use complicated oxygen respirator. If we can stay under water for a long time through an easy way, many changes will occur in our marine lifestyle. TRITON is a very convenient oxygen respirator concept. It allows us to breathe under water for a long time by simply biting it. It also does not require the skill of breathing in and out while biting mouth piece like conventional respirator. It is a portal oxygen respirator for breathing under water as if being on ground by simply biting it.