Which method of attacking newer-model safes is deemed impractical?

The method of attacking newer-model safes that is deemed impractical is manipulation. This technique involves using tools to feel the internal components of the lock and determine the correct combination or alignment of the tumblers. While manipulation can be effective on older locks with simpler designs, newer-model safes are typically equipped with advanced locking mechanisms and a variety of security features that significantly reduce the effectiveness of such an approach.

Manufacturers of modern safes often employ better materials, intricate lock designs, and electronic systems that are far less susceptible to manipulation. These enhancements make it much more challenging for an attacker to exploit the mechanical features of the lock, thereby making manipulation an impractical option for cracking newer safes.

In contrast, other methods such as peel (using a tool to pry open the safe door), punch (creating a hole to access the contents), and burn (using heat to cut through or destroy the locking mechanism) may still yield results against certain types of safes, although they can also have varying degrees of effectiveness and risks associated with them.