For water temperatures above 99°F, what must be done before diving?

• A. Do not dive above 99°F without first contacting NAVSEA 00C
• B. Contact NAVSEA 00C if water is cooler than 60°F
• C. Contact NAVSEA 00C for any dive regardless of temperature
• D. There is no requirement to contact NAVSEA 00C

Answer: (A)

When water is extremely warm, it changes the safety considerations for a dive, so a higher level review is required. If the water temperature exceeds 99°F, you must contact NAVSEA 00C before diving to obtain authorization and any temperature-specific instructions. This step ensures the dive plan accounts for heat-related stress, equipment performance under warm conditions, hydration, and readiness of surface support, and it allows NAVSEA 00C to advise on any additional precautions or restrictions.

The other statements don’t fit because they either trigger contact under the wrong temperature conditions or imply no need for contact at all, which isn’t consistent with the rule for warm water scenarios.