What shape should a forcible entry through a masonry block wall take?

The best approach for creating a forcible entry through a masonry block wall is to utilize the shape of an upside-down V. This shape is advantageous because it allows for efficient penetration while minimizing the risk of the wall collapsing further inward. The upside-down V shape directs the force of the entry tool in a manner that targets the weaker points of the wall, which are typically the mortar joints between the blocks.

Creating this shape facilitates breaking out the masonry without excessively damaging surrounding areas, making it a strategic choice for firefighters. Additionally, an upside-down V enables rescuers to create an opening large enough for personnel and equipment to pass through without excessive effort or risk of injury.

Other options, such as a V or circle, might not provide the same level of stability or efficiency and can lead to unwanted structural failure or make it harder to clear the opening. A vertical rectangle might not maximize the use of weak points in the wall and can also present challenges during the entry process. Thus, the upside-down V is the most effective method for forcible entry in this scenario.