What should be part of every divers' pre-dive checklist?

Checking a buddy’s air supply is an essential component of every diver's pre-dive checklist because it directly relates to safety and provides assurance that both divers are adequately prepared for the dive. Communication and mutual responsibility are key principles in scuba diving, and confirming that both divers have sufficient air before entering the water helps to prevent emergencies that could arise from running low on air.

Additionally, buddy checks often encompass not only air supply but also equipment functionality, ensuring that both divers' gear is in good working order. This crucial step enhances the safety of the dive by fostering teamwork and awareness of each other's conditions. Therefore, checking a buddy's air supply is vital in ensuring that both divers can complete their dive safely and enjoyably.