A total of eight Border Wall prototypes were seen taking form in San Diego, California on Thursday. /Caixin Photo

These prototypes are said to be between five and nine meters tall, according to the US Customs and Border Protection Office. /Caixin Photo

They have also been designed to be tough to climb or break. /Caixin Photo

There have been almost nine months between US President Donald Trump signing the executive order of building the wall along the southwest border between the US and Mexico, and the construction of these prototypes, according to reports. /Caixin Photo