U.S. Virgin Islands

USA

USA Alaska

USA California

USA FL Florida

USA Haiwaii

USA Nevada

USA pool

Ukraine

Ulithi-Atoll, Karolinen Inseln Pazifik, Yap Micronesia

Uluburun II Wreck Replica of Bronze Age Wreck, Kas Mittelmeer, Turkey

Ulva lactuca

Ulysses Butterfly, Queensland, Australia, Papilio ulysses joesa

Umbellate tree corals, Raja Ampat Irian Jaya West Papua Indopazifik, Indonesia, Dendronephthya Morchellana sp.

Umbellulifera sp.

Umbraculum mediterraneum

Umbraculum umbraculum

Umbrella Sidegill Sea Slug, Ponza, Italy, Umbraculum umbraculum

Umbrella Sidegill Slug, Cres Adria, Croatia, Umbraculum mediterraneum

Umbrella Sidegill Slug, Susac Dalmatien Adria, Croatia, Umbraculum mediterraneum

Umbrella Sidegill Slug, Unije Adria, Croatia, Umbraculum mediterraneum

Umbrella Sidegill Slug, Vis Dalmatien Adria, Croatia, Umbraculum mediterraneum

Under-over of brown algae forest, Ulleung-Do, South Korea, Sargassum horneri

Under-over of sea floor and sea slug, Ulleung-Do, South Korea, Aplysia kurodai

Underside of Cushion Star, Lembeh Strait Nord Sulawesi, Indonesia, Culcita novaguineae

Underwater Bubble Ring made by Scuba Diver, Baa Atoll Indischer Ozean, Maldives

Underwater Cave Los Islotes, Cortezsee Niederkalifornien La Paz, Mexico

Underwater Cave, Abu Dabab Marsa Alam Rotes Meer, Egypt

Underwater Cave, Bili Rat Insel Vis Adria, Croatia

Underwater Cave, Pazifik Mikronesien, Palau

Underwater Landscape of Lago del Sambuco, Lavizzara Tal Tessin, Switzerland

Underwater Landscape with Algae, Fernando de Noronha Pernambuco, Brazil

Underwater Photographer and Diver, Insel Lastovo Bijelac Adria, Croatia

Underwater Photographer at Liberty Wreck, Tulamben Bali, Indonesiea

Underwater Photographer at Salt Pier, Karibik Niederlaendische Antillen, Bonaire

Underwater Photographer at shallow Reef, Insel Gangga Nord Sulawesi, Indonesia

Underwater Sign Language O.K Signal, ,

Underwater View of Ocean Surface, Rotes Meer, Egypt

Underwater Wedding, , Thailand

Underwater surface, Afrika Sinai Sharm el Sheik Rotes Meer, Egypt

Underwaterphotographer at Coral Reef, Raja Ampat Irian Jaya West Papua Indo-Pazifik, Indonesia

Undulated Moray Eel cleaned by Scarlet Cleaner Shrimp, Big Island Hawaii, USA, Gymnothorax undulatus Lysmata amboinensis

Undulated Moray, Kona Big Island, Hawaii USA, Gymnothoray undulatus

Undulated Moray, Maui, Hawaii USA, Gymnothorax undulatus

Unesco World Heritage Site Willemstad, Karibik, Curacao

Unicorn Shrimp, Bucht von Triscavac Insel Susac Adria, Croatia, Pleisionika narval

Unicorn Shrimp, Kap von Triscavac Insel Susac Adria, Croatia, Pleisionika narval

Unicorn Shrimp, Susac Adria, Croatia, Plesionika narval

Unicorn Shrimp, Susac Dalmatien Adria, Croatia, Pleisionika narval

Unidenfied Shrimp, Lembeh Strait Sulawesi Celebes, Indonesia

Unidentified Fossil Bird, Fossil Butte National Monument Wyoming, USA

Unidentified Fossil Bird, Green River Formation Wyoming, USA

Unidentified Species

Uninhabitat Island, Felidhu Atoll, Maldives

Uninhabited island at Namu Atoll, Namu Atoll Pazifik, Marshall Islands

Unique Marine Lake, Raja Ampat West Papua, Indonesia

University of Hawaii 2.2-meter Telescope and moon, Mauna Kea Big Island, Hawaii USA

Unknown Tube Worm, Lembeh Strait Sulawesi, Indonesia

Unknown ship wreck and scuba diver, Bismark Sea, Papua New Guinea

Unknown ship wreck, Bismark Sea, Papua New Guinea

Unknown ship wreck, Zabargad Zabarghad Rotes Meer, Egypt

Unloading of Fish at the Port of Suao, Suao, Taiwan Republic China

Untouched sandy beach, Cocos Insel Suedamerika, Costa Rica South america

Unusual Yellow Gorgonia usually this Kind is red or yellow-red, Marettimo Aegadische Inseln Sizilien Mittelmeer, Italy, Paramuricea clavata

Upper Gallery of Hagia Sophia, Istanbul, Turkey

Upper Yosemite Falls in Winter, Yosemite National Park, California USA

Upright Tuna Boat Wreck, Marovo Lagune, Solomon Islands

Upside Down Jellyfish in Marine Lake, Raja Ampat West Papua, Indonesia, Cassiopea sp.

Upside-Down Jellyfish at Surface, Risong Bay Mikronesien, Palau, Cassiopea andromeda

Upside-Down Jellyfish on Sand, Risong Bay Mikronesien, Palau, Cassiopea andromeda

Upside-Down Jellyfish, Turneffe Atoll Karibik, Belize, Cassiopea xamachana

Upside-down Jellyfish, Lembeh Strait Sulawesi Celebes, Indonesia, Cassiopeia andrommeda

Uranoscopus bicinctus

Uranoscopus chinensis

Uranoscopus scaber

Uranoscopus sp.

Uranoscopus sulphureus

Uraspis secunda

Urasterias lincki

Uria aalge albionis

Urobatis concentricus

Urobatis jamaicensis

Urocaridella

Urocaridella antonbruunii

Urocaridella sp.

Urocaridella sp. A

Urocaridella sp. Rhopalaea sp.

Urocaridella sp.B

Urocaridella sp.B Scarus prasiognathos

Urogymnus asperrimus Urogymnus africanus

Urolophus aurantiacus

Urolophus cruciatus

Urolophus jamaicensis

Urolophus sp.

Ursus maritimus

Urticina Sea Anemony and Scuba Diver, Weisses Meer Karelien, Russia, Urticina crassicornis

Urticina Sea Anemony, Weisses Meer Karelien, Russia, Urticina crassicornis

Urticina crassicornis

Urticina eques

Urticina felina

Urticina lofotensis

Urticina piscivora

Utensils of Xhosa Sangoma Medicine Man, Wild Coast Ostkap, South Africa

umbellate tree soft coral and sea star, Raja Ampat Irian Jaya West Papua Indopazifik, Indonesia, Dendronephthya sp. Choriaster granulatus

underwater grotto and soft corals, Zabargad Zabarghad Rotes Meer, Egypt

underwater photographer ready to dive under the ice, Lancaster Sound Nunavut Nord Baffin Island, Canada Arctic

underwater plants, Lago di Capo d'Acqua Abruzzen, Italy

undulated moray with cleaner shrimp, Lembeh Strait Sulawesi Celebes, Indonesia, Gymnothorax undulatus

unidentified

unidentyfied

uninhabited Island of Maldives, Indischer Ozean Meemu Atoll, Maldives

urchin crab in fire urchin, Raja Ampat Irian Jaya West Papua Indopazifik, Indonesia, Zebrida adamsii Asthenosoma varium

urn ascidia, Komodo Indischer Ozean, Indonesia, Didemnum molle