The top 10 safety tips for scuba diving include: 1. Never hold your breath. 2. Never dive alone. 3. Ascend slowly from every dive. 4. Perform a safety stop at 5-6 metres (16-20 feet) on every dive. 5. Plan your dive and dive the plan. 6. Know your limits and dive within your limitations. 7. Check your air contents gauge regularly. 8. Always dive with an alternative air source or octopus. 9. Always perform the ABC buddy check before your dive. 10. Only dive if you’re fit to dive.