Transportation
Down Under the water we need ways to get tot he earths surface.  We use deep sea submarines.  These Submarines have really strong metal all around it to keep from crushing under the pressure. 
We use these submairines to visit the surface.  Maybe to see a loved on, to get supplies, to give information, or maybe just to get some sun.
With this High tech submarines, we can have fast travel to the surface without hurting our ears.
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