Which statement best describes the primary purpose of a submarine's snorkel?

Which statement best describes the primary purpose of a submarine's snorkel?

• A. To increase underwater speed by using snorkel blades.
• B. To provide a communications channel with surface ships.
• C. To draw in air for diesel engines while near the surface, reducing the need to fully surface.
• D. To store spare batteries.

Answer: (C)

The main idea is that the snorkel provides air for the diesel engines when the submarine is near the surface, so those engines can run to generate electricity and recharge the batteries without fully breaking the surface. Diesel-electric submarines rely on battery power for quiet underwater propulsion, and recharging those batteries while staying mostly submerged extends their endurance and reduces the chance of being spotted. It isn’t about increasing underwater speed, it isn’t primarily a communications channel, and it doesn’t store batteries—the snorkel’s purpose is to feed the engines with air so they can operate while the boat remains largely hidden.

The main idea is that the snorkel provides air for the diesel engines when the submarine is near the surface, so those engines can run to generate electricity and recharge the batteries without fully breaking the surface. Diesel-electric submarines rely on battery power for quiet underwater propulsion, and recharging those batteries while staying mostly submerged extends their endurance and reduces the chance of being spotted. It isn’t about increasing underwater speed, it isn’t primarily a communications channel, and it doesn’t store batteries—the snorkel’s purpose is to feed the engines with air so they can operate while the boat remains largely hidden.