What is this? Basement Vents?

[Dan L.]

Hi all. All around the perimeter of this (unfinished/abandoned) 5k sq ft commercial building, there are these openings into the basement. The ground is dug out around the building, like a trench, and then these openings are throughout. They look like they are for ventilation of some sort? I am assuming they should have some kind of cap on them? What are they called, just so I can research more?

Below are a couple of pictures to show them. Thanks!