Research into the story of the sinking of the Britannia , including the story of passenger Frederick Bower.

The obituary of William McVicar, the officer in charge of Britannia's lifeboat number 7 which reached the coast of Brazil after 23 days with 38 survivors. The lifeboat had set out, overloaded, with 82 people. (This article gives the date of Britannia's sinking, incorrectly, as the 23rd March.)

The obituary of Vice Admiral Sir Ian McIntosh, who was instrumental in helping McVicar navigate Lifeboat Number Seven.

Information about the site of the wreck of the Britannia.

The Wikipedia entry for the Britannia

The Wikipedia entry for the Thor

The Wikipedia entry for Kapitän zur See Otto Kähler, captain of the Thor.

This site tells the stories of many German warships including this detailed account of the raider Thor.  The story is in chronological order and the description of the encounter with the Britannia can be found about one third of the way through.

German newsreel film of the Thor on a visit to Japan, under the command of Kapitän zur See Günter Gumprich

The story of Lifeboat Number 7 as reported in the 19 May 1941 issue of LIFE Magazine.