Despina's cousin, Nikolas, is an ocean engineer and teaches her about submersibles. Each submersible is designed to have specific instruments which help both scientists and ocean engineers collect data about the ocean. Realizing one of the instruments is a manipulator arm, Despina connects this idea to possibly designing her own submersible with this very instrument. This way, she can get the goggles she lost!
Using the engineering design process, and learning about how changing the density of the submersible enables it to sink and float, Despina gets the goggles back because of her problem-solving approach!