How is a deep sea submersible similar to a spacecraft?

A deep sea submersible and a spacecraft are similar in that both are designed to operate in extreme environments—submersibles in the high-pressure depths of the ocean and spacecraft in the vacuum of space. They are engineered to withstand harsh conditions, utilizing specialized materials and technology to ensure the safety of their occupants and the integrity of their systems. Both types of vehicles often rely on advanced navigation, communication, and life-support systems to function effectively in their respective realms. Additionally, both serve scientific exploration purposes, providing valuable data about uncharted territories.