Workers are entering a partially flooded trench to perform repairs on a water main. The trench is 1.8 metres deep. What is the minimum number of rescuers required to be immediately available on site, outside the trench, with appropriate equipment according to typical confined space or trench safety regulations?

Question: Workers are entering a partially flooded trench to perform repairs on a water main. The trench is 1.8 metres deep. What is the minimum number of rescuers required to be immediately available on site, outside the trench, with appropriate equipment according to typical confined space or trench safety regulations?

Answer options:

• One trained rescuer. ✅ Two trained rescuers.
• Three trained rescuers.
• No specific number, as long as 911 is on speed dial.

Correct answer: Two trained rescuers.

Explanation: For entries into confined spaces or trenches where rescues may be necessary, and especially with water present increasing hazards, at least two trained rescuers must be immediately available outside the point of entry and capable of initiating a rescue, as per good practice and many OHS regulations (e.g., O. Reg. 632/05 for Confined Spaces in Ontario, which informs trench safety).