Deep within the inky darkness of the ocean's abyssal zone, a colossal, realistic alien starship looms, its sleek, aerodynamic silhouette piercing the faint glow of bioluminescent marine life. The black tinted glass windows glimmer like polished onyx, reflecting the vibrant hues of underwater lights that illuminate the surrounding waters. As we descend into the heart of this extraterrestrial military stronghold, a sprawling underwater base unfolds before us, teeming with detailed, realistic architecture and bustling alien activity.