This one we actually first discovered back in the air days -- the bad old air days, as we used to say -- when we were doing these kind of dives with air.
这实际上是我们在以前的空气潜水岁月里发现的，空气潜水差劲的岁月 也就是过去所说的当我们使用空气来作这类潜水的时候