A single breath will allow a Bottlenosed Dolphin to stay underwater for many minutes. It is unusual for Bottlenosed Dolphins to swim with divers. Divers are constantly blowing a stream of bubbles out of their scuba gear, and scientists think these bubbles scare the dolphins. The reason they think this is that wild dolphins travel in extended families, called pods. A pod has as many as 20 male and female dolphins.
Whales also are mammals that travel in pods, and are closely related to dolphins.
When a pod of whales meets another male whale in the water, the males from the pod will swim between the stranger and the pod s females, and will blow bubbles from their blowholes underwater to try to hide the females from the stranger. Dolphin pods may do the same thing. So, when a dolphin sees all those bubbles, it may feel like it is not welcome and swim away. Spot is different. He obviously likes people, and doesn t swim away from scuba divers.