They can be broken into of course, but offer a hell of job to the crook. Thieves assume there are valuables anywhere and everywhere, and so the shipping container is designed especially with that in mind. You must have enough access for a semi to reverse into the property. This takes just three or four minutes, once the truck is in. If they come in on a semi, they are dropped off from the side of the trailer. They are strong, well made, and come in 20 or 40 foot lengths. As a former operater of semi's, driving containers around, I can give you a few tips.