When dealing with bell holes, which are essentially belled areas of excavated shafts, there are specific safety requirements that must be adhered to in order to protect workers. According to the Occupational Health and Safety Regulations, 2020 (Sask. Reg. 10/2020), an employer or contractor must ensure that a worker is not required or permitted to enter the belled area of an excavated shaft unless the worker is protected by a temporary protective structure designed by a professional engineer. This structure must be constructed, installed, used, maintained, and dismantled in accordance with the engineer's design [1]. Additionally, workers should not remain in a belled area if they may be exposed to falling materials [1].

These regulations are crucial for preventing accidents and ensuring the safety of workers in potentially hazardous environments. It is important for employers to comply with these requirements and provide the necessary protective structures and training to their workers.