The deadline for proposals to build Trump's big wall between Mexico and the United States came and went on Tuesday, and while the government will wait until June 1 to announce which companies made the first cut to make models of their proposals, several of those companies have released their plans to the public

Specifications for the wall include that it must be able to repel pickaxes and sledgehammers for at least an hour, and be "aesthetically pleasing" on the north side that would face the United States. Builders must show that they have experience "executing high-profile, high-visibility, and politically contentious" projects. Preventing tunnels must be taken into account, too. U.S officials have told the Associated Press that they expect to choose four to 10 bidders that would build prototypes for $200,000 to $500,000 each.