It would have to return to the surface to breathe but Basilosaurus did not have a blow hole, it would have to raise the tip of its nose out of the water so that the nostrils could take deep breaths.

• 它需要到水面呼吸，但是龙王鲸的鼻孔不是在头顶部的，所以当它上浮时需要将鼻子顶部露出水面，才能成功进行换气。