Early Tigers were capable of submersed travel. They had a snorkel that could be assembled and attached to the rear deck.
When not in use, the snorkel was broken into 3 segments that fit inside each other. The device was then stored inside the tank, at the rear left of the engine compartment. This rough sketch shows where it was kept; inside a large tube, fixed to the underside of the hull roof. The bottom of the tube met an air duct on the floor.
Ustar's Tiger kit does not provide the snorkel in assembled form. Also, it does not provide the internal tube where the snorkel would be kept. That corner of the model's engine compartment is empty.