Do you know why the Russian word "Okean" is supposedly not written with the letter "Yo" to avoid activating a secret bomb? This astonishing online myth keeps stirring debate, but is it true? The letter "Yo" entered Russian writing in 1783, when Princess Ekaterina Dashkova proposed it. In modern usage it is usually required only in textbooks, dictionaries, and cases where it prevents confusion between similar words, such as "vse" ("everyone") and "vsyo" ("everything"). The Russian Navy never fielded bombs or torpedoes codenamed "Okean" whose detonation depended on punctuation. That story is a complete fabrication and is not supported by naval evidence. In reality, the optional use of "Yo" in print is a long-standing convention from the 19th century, meant to save space, ink, and typesetting effort. Replacing it with "E" does not create dramatic consequences. So the word "Okean" is written with "E" in ordinary Russian spelling. It is a linguistic habit, not a trigger for a global catastrophe.