Key challenges include limited mobility and visibility underwater. To address mobility, consider equipping the cartoon girl with flippers, propellers, or hydrofoils for enhanced speed and maneuverability. For visibility, implement dynamic lighting or night vision goggles to illuminate murky depths and enhance object detection.

Strategic solutions involve adapting to diverse underwater conditions. Utilize sonar or echolocation systems to map out the environment and detect hidden obstacles or creatures. Additionally, consider providing the cartoon girl with a protective suit or exoskeleton to withstand underwater pressures and potential hazards encountered during her explorations.