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Curious about Submarines

Submarines dive deep and silently creep up on enemy ships. Just how deep do they go? And how do they navigate with no windows? Tap into kids' natural curiosity about the high-interest topic of military vehicles with questions and answers about how submarines work. An inquiry-based format guides early elementary readers with accessible language about sonar navigation, how long subs can stay underwater, and the world's quietest and most deadly sub.