A Hawaiian green sea turtle swims gracefully over a coral reef in clear blue water

sea turtle hawaiian green turtle honu coral reef underwater marine life swimming ocean clear water blue sea aquatic marine wildlife nature reef tropical hawaii serene peaceful diving snorkeling conservation endangered species ecology marine biology sea life aquatic animal turtle shell fins sea creatures tranquil underwater photography closeup marine ecosystem coral aquatic habitat natural beauty fauna oceanic biodiversity wildlife protection underwater world sanctuary aquatic environment turtle underwater shot