This photograph was purportedly taken 15-20 seconds after the explosion. The National Library and Archives Canada description estimates the distance from the explosion as approximately 2 kilometres (one and a quarter miles) and that it was taken at Bedford Basin, Halifax, Nova Scotia, Canada, looking south down Halifax Harbour. Photographer: unknown.<br><br><p>The height of the blast at its peak was measured at approximately 12,000 feet (3,657.6 metres) on a sextant by Captain W. M. A. Campbell of the Canadian merchant ship, SS <i>Acadien</i>, approximately 24.14 km (15 mi) from the harbour approaches. 
In Canada - from the David Millar Collection (NLAC). In the U.S. - National Archives and Records Administration (NARA) Reference #165-WW-158A-15. Original source: Underwood &amp; Underwood. Print only - no negative available.<br><br></p>
Reproduction service has been withdrawn in Canada (NLAC). In the U.S., reproductions are available from NARA.
Unknown author<span style="display: none;">Unknown author</span>
1917-12-06
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