However, here are some creative options:
Formal:
* A team of scuba divers
* A group of scuba divers
* A party of scuba divers
Informal:
* A pod of scuba divers (evoking a sense of unity and movement underwater)
* A school of scuba divers (referencing their shared activity and organized movement)
* A bubble of scuba divers (playing on the bubbles they exhale underwater)
Ultimately, the best collective noun depends on the context and desired tone.