Final answer:
The required notice on the deck for pools where diving is not allowed or the depth is less than 5 feet is 'No Diving'. This warning is vital for safety as diving in shallow water can lead to significant injuries. Safety placards are common for both poolside and diving activities to educate about risks such as pressurized gases and ensure safe diving practices.
Step-by-step explanation:
All pools where diving is not allowed or the pool depth is less than 5 feet shall provide notice on the deck which says 'No Diving'. It's important to always heed the advice of signs that warn against diving in shallow areas to prevent serious injuries. Diving into water that isn't deep enough can result in harm to your nervous system due to the pressure increase experienced even just a meter or so below the surface, given that water is much denser than air. Placards and signs are not only used for practical safety rules in swimming pools but also for informative purposes at dive centers, like the ones near SCUBA diving location where public awareness sessions are held and information about diving safety, such as buoyancy, pressure equalization, and time spent underwater, is distributed. For instance, placards were placed near SCUBA diving ventures in the Azores as part of public safety education efforts. These measures emphasize the importance of being aware of the risks associated with diving, including those associated with pressurized gases in the body as explained in the context of SCUBA diving.