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A shipwreck is what remains of a ship that has wrecked, either sunk or beached. Whatever the cause, a sunken ship or a wrecked ship is a physical example of the event: this explains why the two concepts are often overlapping in English. A shipwreck could be called a wreck if the structure is still recognizable or a wreckage if it is not recognizable anymore. The United Nations estimates that there are more than 3 million shipwrecks on the ocean floor...

Dolphins are marine mammals that are closely related to whales and porpoises. There are almost forty species of dolphin in seventeen genera. They vary in size from 1.2 m (4 ft) and 40 kg (90 lb) (Maui's Dolphin), up to 9.5 m (30 ft) and 10 tonnes (9.8 LT; 11 ST) (the Orca or Killer Whale). They are found worldwide, mostly in the shallower seas of the continental shelves, and are carnivores, mostly eating fish and squid...

Russia (/ˈrʌʃə/; Russian: Россия, tr. Rossiya, IPA: /rɐˈsʲijə/), officially known as both Russia and the Russian Federation (Russian: Российская Федерация, tr. Rossiyskaya Federatsiya, IPA: (rɐˈsʲijskəjə fʲɪdʲɪˈratsɨjə)), is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

A POTD is an acronym for "Photo of the Day", "Picture of the Day", "Post of the Day" or "Poll of the Day". It is a term most commonly used by online digital photography communities as an honor to outstanding photos that are selected daily from among that community's membership. They can either be tagged as POTD or displayed in a special page on that site...