🔍 Key Concepts

• Submarine emergency signals used to communicate with surface vessels • Differences between a submarine that is operating normally vs in distress • Use of parachute‑borne flares or signals to mark position and intent

💭 Think About

• Ask yourself: is a high, parachute‑borne yellow signal more likely to be used to show routine maneuvering, or to get maximum attention in an emergency? • Consider which of the choices describes a situation where the submarine crew most needs to alert and warn all nearby surface ships clearly and from a distance. • Think about whether the signal is just telling you what depth they’ll be at, or whether it’s telling you something about their condition (normal vs trouble) and their intended action.

✅ Before You Answer

• Verify which options explicitly mention distress versus normal operations. • Check which option both indicates distress and gives you the submarine’s intended next move so nearby ships can take precautions. • Make sure the signal’s characteristics (yellow, parachute, high above the water) fit something that must be highly visible over a wide area, not just a routine depth change.