The LVRI is 104 millimetres a mercury worth of partial pressure, but the blood is only 40 millimetres. That's because all the oxygen's been used up in the body. So the oxygen's lower. And so the blood combed back to the lungs is low in oxygen. But it can become problematic in warming dive, right? All right. Let's just focus on oxygen carbon dioxide because nitrogen doesn't really need to... It can cross. Yeah. Once it's in the blood, it just moves through unchanged. Is it inert? It's inert. Okay. You can ... But it can becoming problematic in warming Dive if you're trying to get into warm water