Need for Searchlights. Searchlights On Ocean Liners. Illustrations show how powerful head lights could be fitted to liners to improve night vision. The collision and loss of the Titanic seems to have been due more than anything to the invisibility of an iceberg at night. Titanic was built by Harland & Wolff in Belfast Ireland during 1910 - 1911 and later sank on April 15th, 1912 after striking an iceberg off the coast of New Foundland during her maiden voyage from Southampton, England to New Yor