Create an epic street art mural depicting a group of mystical sea creatures exploring an underwater wonderland, their vibrant scales shimmering in the depths as they encounter ancient ruins and hidden treasures.

A vibrant street art mural showing a diverse group of mystical sea creatures exploring an underwater wonderland. Let their uniquely hued scales shimmer brilliantly into the watery depths. They encounter ancient sunken ruins and a trove of hidden treasures, evoking a sense of mystery. Their expressions full of wonder, they navigate their way through tall sea grass and overgrown seaweed, against the backdrop of a sunlight-speckled ocean.