A deep-sea diver in ornate, steampunk-inspired gear pauses at the edge of a hidden underwater city. The city glows with an ethereal, bioluminescent light, a stark contrast to the dark ocean depths. Schools of exotic, glowing fish swirl around the diver, their scales shimmering with vibrant colors. Ancient, barnacle-encrusted artifacts litter the seabed. The diver's oxygen gauge is visibly low. The scene blends the intricate, mechanical details of steampunk with the whimsical, detailed artistry of a Studio Ghibli film