Early morning swimmer. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3336892/free-photo-image-swim-swimming-sportsFree Image from public domain licenseSeahorse at The Monterey Bay Aquarium in Monterey, California. Original image from Carol M. Highsmith’s America… https://www.rawpixel.com/image/434163/seahorseFree Image from public domain licenseAquarium Berlin, Berlin, Germany. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286190/free-photo-image-underwater-sea-backgroundFree Image from public domain licenseUnderwater shot of stringway with sunlight casting shadow on sandy ocean floor. Original public domain image from Wikimedia… https://www.rawpixel.com/image/3286080/free-photo-image-ocean-fish-fishesFree Image from public domain licenseSeal in Antarctica. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3305499/free-photo-image-seal-sea-turtle-antarcticaFree Image from public domain licenseCoral Reef at Dry Tortugas National Park. Original public domain image from Flickr https://www.rawpixel.com/image/4026644/photo-image-ocean-nature-seaFree Image from public domain licenseKid with goggles holding up starfish from ocean, location unknown, 24 March 2017. View public domain image source here https://www.rawpixel.com/image/6111373/photo-image-face-public-domain-oceanFree Image from public domain licenseTwo rows of boathouses connected by a wooden walkway. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3284818/free-photo-image-ship-nature-sea-travelFree Image from public domain licenseLeConte Seal. Tongass National Forest, Alaska. Original public domain image from Flickr https://www.rawpixel.com/image/3388306/free-photo-image-forest-nature-alaskaFree Image from public domain licenseA school of fish at the Alexander Springs Recreation Area, Ocala National Forest, Florida. Original public domain image from… https://www.rawpixel.com/image/3388327/free-photo-image-fish-public-domain-nature-animalFree Image from public domain licenseA person swimming underwater with the sun shining into the green lake at Brohm Lake. Original public domain image from… https://www.rawpixel.com/image/3282396/free-photo-image-water-brohm-lake-canadaFree Image from public domain licenseJellyfish with stripes. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3305761/free-photo-image-minimal-smoke-medusaFree Image from public domain licenseHumpback whale underwater, Marine mammal. Original public domain image from Flickr https://www.rawpixel.com/image/8752677/photo-image-public-domain-ocean-seaFree Image from public domain licenseWhale 1, Edo period (18th-19th century) illustrated by Daderot. Original public domain image from Wikimedia Commons.… https://www.rawpixel.com/image/10184761/image-art-illustration-animalFree Image from public domain licenseUnderwater view of air bubbles and diver`s legs while diving at Panama City Beach. Original public domain image from… https://www.rawpixel.com/image/3283943/free-photo-image-ocean-underwater-scubaFree Image from public domain licenseUp + down. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3336822/free-photo-image-explore-ocean-sea-scuba-divingFree Image from public domain licenseChildren participate in snorkeling activities at the Alexander Springs Recreation Area, Ocala National Forest, Florida.… https://www.rawpixel.com/image/3388212/free-photo-image-algae-adventure-waterFree Image from public domain licenseExotic marine lives. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3284930/free-photo-image-swim-marine-life-animalFree Image from public domain licenseSharks and Fish. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3282886/free-photo-image-public-domain-animal-shark-sea-wildlifeFree Image from public domain licenseA Bowhead whale resting on a sandbank. Chromolithograph by F. Gerasch after A. Gerasch, 1860/1880. https://www.rawpixel.com/image/13951623/image-art-sea-animalFree Image from public domain licenseZoo Berlin, Berlin, Germany. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286893/free-photo-image-jellyfish-fish-animalFree Image from public domain licenseMEDITERRANEAN SEA. Explosive Ordnance Disposal Technician 2nd Class Shawn Geiser, assigned to Explosive Ordnance Disposal… https://www.rawpixel.com/image/3393646/free-photo-image-sea-water-military-soldierFree Image from public domain licenseDiving in the sea. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3282223/free-photo-image-underwater-accessory-armFree Image from public domain licenseCapt. David Culpepper, Commanding Officer, Naval Station Guantanamo Bay, Cuba, surveys a healthy reef off the coast of… https://www.rawpixel.com/image/3317815/free-photo-image-diving-underwater-deep-sea-scuba-diverFree Image from public domain license