Some people are amphibians; half spirit and half animal - as spirits they belong to the eternal world, but as animals they inhabit time. If they don't sneak underwater, they'll get squashed.
Key credits listed on this page include Borzoo Niknejad, Javad Ezzati, Setareh Pesyani, Hadi Hejazifar, Mani Haghighi, Saeed Poursamimi, and Pejman Jamshidi.