Humans use facial recognition to identify other humans. That’s tough underwater. Everyone is wearing a mask, and all the dive suits tend to look the same (i.e. black). Instead, we are taught to learn what fins the other divers are wearing. SCUBA fins are much more varied in design than wetsuits and tend to come in more colors. Therefore, they are more easily recognizable. Learn which fins your dive buddy is wearing, and you can spot them from quite a distance underwater.
These fins are lined up on the dive deck of the Bahamas Aggressor ready to be donned for the next dive.