Impact excavates a uniquely useful crater, 9 km across. This is Omaha Crater, named after the U.S. Army’s most hard-won D-Day beachhead. Omaha Crater is dotted at creation with a pattern of worksite depressions. Bedrock holds one quintillion (1018
) Joules of impact heat, centered on the new, lowest point on Mars. Here 1.3 kPa of atmospheric pressure, the depressions, and crater heat make possible a lake and other reservoirs for settlement use. Water surface temperature is set via heat exchange below 11 °
C to prevent boil-off.
In time, settlement industries will vent excess oxygen into the crater, forming a protective local ozone layer. Ozone, heat and the pressure of air and water set the stage for a photosynthetic archipelago on the open crater floor – a true terraformation site.
The terraformation resources persist beyond our time. Omaha Crater bedrock will remain warm to the touch for thousands of years.