They can submerge, remain submerged and resurface. They are water-tight so that when submerged they do not fill up with water and so lose their buoyancy. Also they have buoyancy tanks into which water is allowed to enter and so increase the mass of the submersible. This makes it submerge. But that water can be pumped out to increase the buoyancy when the submersible wishes to return to the surface.
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The faces of Platonic solids are regular polygons...
Well, around 300. Some are out of order, and only a few can still work.
it has to be made out of strait lines so no curves and it has to be closed last it has to be flat it cant be 3D
A regular tessellation is one that uses regular polygons. An interior angle of a regular pentagon measures 108 degrees. A full circle, 360 degrees, is not divisible by 108 degrees. Consequently, it is not possible to arrange a number of polygons so that they meet at a point without gap or overlap.