A look at the 8 border wall prototypes along U.S.-Mexico border

SAN DIEGO, Calif. (FOX 11) - President Trump's campaign promise to build a border wall is turning into a reality.

There are eight border wall prototypes up in San Diego and all will undergo rigorous testing to make sure that no one can get around them.

The six companies that built the prototypes were:

Caddell Construction Co. (DE), LLC, Montgomery, Alabama.
Fisher Sand & Gravel Co., DBA Fisher Industries, Tempe, Arizona.
Texas Sterling Construction Co., Houston, Texas.
W. G. Yates & Sons Construction Company, Philadelphia, Mississippi.
KWR Construction, Inc., Sierra Vista, Arizona
ELTA North America Inc., Annapolis Junction, Maryland

The border wall prototypes vary in material, style and color, and all extend six feet below the ground.

FOX 11's Gina Silva reports from San Diego.