How deep can you dive with an open water certification?

The depth you can you dive with an open water certification with diving organisations like PADI and SSI is 18 metres (60 feet). But there are other diving organisations that also call their first certification level ‘open water diver.’ Some use the 18 metres depth level, whereas others use 20 metres (66 feet) as their safe depth for newly certified scuba divers. BSAC call their first certification level Ocean Diver, where the depth limit is set at 20 metres.