подлодки

In a sentence

• Военные подлодки патрулируют воды океана.

  Military submarines patrol the ocean waters.

  In this sentence, 'подлодки' is plural and refers to military submarines, showing its contextual usage in a naval environment.

• Я видел подлодки в музее морской техники.

  I saw submarines in the maritime technology museum.

  Here, 'подлодки' is used in the context of historical or technological exhibits to describe submarines.

• Старые подлодки использовались для исследований морских глубин.

  Old submarines were used for deep sea exploration.

  In this instance, 'подлодки' is referring to submarines employed in scientific research, illustrating its adaptable description based on use.