Ridgway S H, Scronce B L, Kanwisher J
Science. 1969 Dec 26;166(3913):1651-4. doi: 10.1126/science.166.3913.1651.
A bottlenose porpoise was trained to dive untethered in the open ocean and to exhale into an underwater collecting funnel before surfacing from prescribed depths down to 300 meters. The animal was also taught to hold its breath for periods up to 4 minutes at the surface and then blow in the funnel. Alveolar collapse is probably complete at around 100 meters, and little pulmonary respiratory exchange occurs below that depth. Thoracic collapse was observ visually at 10 to 50 meters and by underwater television to 300 meters.
一只宽吻海豚经过训练，可以在公海中自由潜水，并在从规定深度（最深达300米）浮出水面之前向水下收集漏斗呼气。这只动物还被教导在水面上屏住呼吸长达4分钟，然后向漏斗吹气。肺泡塌陷可能在大约100米处完全发生，在该深度以下几乎没有肺部呼吸交换。在10至50米处可以肉眼观察到胸廓塌陷，通过水下电视可以观察到300米处的情况。
