| Aspect | Per Diem Diver | Commercial Diver |
|---|
| Certifications | Open water or basic diving certifications | Advanced certifications like IMCA or ADCI |
| Work Environment | Temporary, short-term projects, often on call | Longer-term, intensive underwater construction or repair |
| Employer & Industry | Freelance, contractor, or maritime companies | Construction, oil & gas, infrastructure |
Per Diem Divers typically hold basic diving certifications and work on short-term projects, often on a per-diem basis. Commercial Divers usually have advanced certifications and undertake longer, more complex underwater tasks in industrial settings. Both roles are essential in underwater work but differ mainly in scope, certification, and work duration.