Why do sea vessels keep on colliding?

  • Thread starter Thread starter pink
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pink

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First two submarines (one was English the other was French) with nuclear onboard crashed into each other under the Atlantic Ocean and now two navy vessels collide with a nuclear powered submarine and another ship.

http://news.yahoo.com/s/ap/20090320/ap_on_re_mi_ea/ml_us_navy_ships_collide

Don't they have a radar to indicate when another vessel is approaching them?
 
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