An underground limestone mine along the Kansas River at Bonner Springs, Kansas, west of Kansas City, has been developed into at least two commercial operations, with separate entrances. One is National Cold Storage, a food services warehouse with truck and rail access, with a half a million square feet of freezer space. North of that is a corporate records storage facility called, aptly, Corporate Record Storage. There is also a recreational zip line operation on the property, which is generally known as the Loring Quarries.