When two divers can swim through side by side, what is the classification of a point where the cave passage gets narrower?

When considering the classification of a point in a cave passage that narrows while two divers can swim side by side, identifying it as a minor restriction is appropriate. A minor restriction indicates that while the passage becomes narrower, it does not significantly impede or obstruct the movement of divers. This classification reflects situations where divers are still able to navigate comfortably, although a reduction in passage width may warrant caution.

In contrast, significant obstruction or major constraint would imply a more serious impediment, where the functionality of the dive could be compromised, making it more challenging for divers to pass through or requiring more rigorous planning. Minor blockage typically suggests a situation where there is an object or a material that is constricting the passage to a greater extent, possibly even creating a stoppage rather than simply a narrower passage. Hence, understanding these distinctions is crucial for safe navigation in cavern diving.