the deep seafloor with aquatic wildlife, treasure chest and shipwrecked steamboat. modern cartoon of deep seafloor with

underwater sea fish shipwreck ship ocean undersea seafloor world treasure cartoon octopus background animal marine aquarium bottom design sunken landscape water summer nature illustration blue cute graphic environment boat life wildlife coin aquatic coral reef seaweed decorative turtle nautical pirate chest vessel seabed ruins wreck deep depth steamboat under ai generated