There are several techniques for crossing a border undetected. These include:

Walking: This is the most straightforward approach, but also the most risky. It requires finding a secluded area of the border and hoping that there are no patrols in the vicinity.

Swimming: This approach is only viable for borders that cross a body of water. It requires being a strong swimmer and having the necessary equipment, such as a floatation device, to make the journey.