Guest Stars David Silbey as Himself (David Silbey - Cornell University) Christopher Capozzola as Himself (Christopher Capozzola - Massachusetts Institute of Technology) Mitchell Yockelson as Himself (Mitchell Yockelson - National Archives and Records Administration) Nick Hewitt as Himself (Nick Hewitt - National Museum of the Royal Navy) Eric Groves as Himself (Professor Eric Groves - University of Salford, UK)