submersible, prawn suit, mechanical drill arm, underwater, deep-sea exploration, Subnautica game, wreckage site, alien technology, resource gathering, titanium, diamond, advanced materials, upgrade, ocean floor, kelp forest, lost river, inactive lava zone, bioluminescent flora, sea creatures, exploration, adventure, first-person view, ambient lighting, murky water, realistic textures, survival equipment, video game environment, treasure hunt, resource nodes, action pose, detailed machinery, high-tech.