<P> U-20 surfaced again at 12: 45 as visibility was now excellent . At 13: 20 something was sighted and Schwieger was summoned to the conning tower: at first it appeared to be several ships because of the number of funnels and masts, but this resolved into one large steamer appearing over the horizon . At 13: 25 the submarine submerged to periscope depth of 11 metres and set a course to intercept the liner at her maximum submerged speed of 9 knots . When the ships had closed to 2 miles (3.2 km) Lusitania turned away, Schwieger feared he had lost his target, but she turned again, this time onto a near ideal course to bring her into position for an attack . At 14: 10 with the target at 700m range he ordered one gyroscopic torpedo to be fired, set to run at a depth of three metres . </P> <P> In Schwieger's own words, recorded in the log of U-20: </P> <P> Torpedo hits starboard side right behind the bridge . An unusually heavy detonation takes place with a very strong explosive cloud . The explosion of the torpedo must have been followed by a second one (boiler or coal or powder?)... The ship stops immediately and heels over to starboard very quickly, immersing simultaneously at the bow...the name Lusitania becomes visible in golden letters . </P> <P> U-20's torpedo officer, Raimund Weisbach, viewed the destruction through the vessel's periscope and felt the explosion was unusually severe . Within six minutes, Lusitania's forecastle began to submerge . </P>

Describe all of the details surrounding the sinking of the lusitania