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About Brigadier Balram Singh Mehta of the 45th Cavalry tank squadron who fought on the eastern front during the Indo-Pakistan war of 1971 along with his siblings.。Legendary oceanographer Sylvia Earle and a cast of pioneering marine scientists tell the story of the incredible work being undertaken across the planet to protect the fragile ecosystem of our oceans. Perpetual Planet: Heroes of the Oceans is a showcase of the wonder of the sea, of the living laboratory we all live in and of the vital science being carried out beneath the waves...。