Others are so-called "self-healing" minefields which can detect when a gap in the field has been created and will direct its mines to reposition themselves to eliminate that gap, making it much more difficult and dangerous to create a safe path through the minefield.
Other types of minefields are termed "self-healing," which can recognize when there is an opening within the field and then guide their mines to relocate themselves to fill that gap. This makes it much harder and riskier to establish a secure route through the minefield.