I would not recommend the Orca S4 for scuba diving. From the Orca website:
Orca’s generation s-series speedsuit, the S4 has been completely re-designed with performance grade materials, setting a new benchmark for entry level open water swimming wetsuits. Building on the popularity of the orca S3, the S4 offers full neoprene coverage, including premium SCS coated 3-4mm Yamamoto 39 cell neoprene across the full front of the wetsuit for hydrodynamics, flexibility, buoyancy and durability. The underarm and shoulder panels use a 2mm Yamamoto 39 cell SCS coated neoprene for increased range of motion and comfort. The back of the S4 is constructed from 3mm Smoothskin neoprene, providing high levels of buoyancy and thermal protection. The silicone-print Hydrostroke Forearm catch panels aid increased power through the stroke, while Speed Transition panels on the calves make removing the wetsuit much easier.