DCHP-1 Online
tunnel boat 
See 1942 quote.
- 1921 An interesting addition to the H.B.C. fleet of northern river transport vessels is the new "tunnel" boat, launched at Vancouver, March 26th.
- 1942 On the Dease River, gasoline propelled "tunnel" boats (that is, boats fitted with a propeller that is retractable into a tunnel) replaced the scows. . . .
- 1958 On stern-wheel river steamboat, three shallow-draft power boats (Called 'tunnel-boats'), and twelve barges, were built.
- 1921 An interesting addition to the H.B.C. fleet of northern river transport vessels is the new "tunnel" boat, launched at Vancouver, March 26th.