Having spent countless hours exploring the depths of Subnautica, I've found that upgrading your vehicle is not just about speed—it's about survival and discovery. Markiplier’s quest to build a faster, deeper vehicle mirrors many players’ desires to push the game's boundaries. From personal experience, focusing on modules that increase depth capacity is crucial, as it allows access to rarer resources and thrilling underwater biomes. Equipping your vehicle with efficient power sources is another key improvement. For example, adding energy efficiency upgrades prevents constant power drain, letting you stay submerged longer without returning to the surface. Furthermore, customizing your submersible with sonar and lighting enhancements can significantly improve exploration, especially in the darker, more dangerous parts of the sea. Markiplier’s approach highlights the importance of balancing speed, durability, and depth capabilities when building your craft. Experimenting with different builds can help find the perfect fit for your playstyle, whether you prefer swift maneuvers or cautious, methodical exploration. Overall, upgrading your Subnautica vehicle transforms gameplay, making underwater adventures more engaging and rewarding.