Blue Ribbon Pet - Exotic Environments Large Sunken Submarine. Exotic Environments Large sized Sunken Submarine 12". Sunken for years this wreckage has become a very unique habitat for tropical fish swimming through cracks in the submarine"s fuselage. Rusted from sitting in the eerie depths, the colorful barnacles and coral around it seem to keep it beautiful. EE-898. 12. 75 x 5 x 7. 5".