John B. King explosion

King explosion was a Canadian maritime disaster on June 26, 1930, when a drill boat containing dynamite was struck by lightning near Brockville, Ontario.

[1] The scow was off the point of Cockburn Island working on blasting a St Lawrence Seaway channel through Brockville narrows, and had drilled several holes of dynamite.

[2] The explosion was witnessed by United States Coast Guard Cutter 211, which then rescued 12 members of the crew of 42.

A memorial plaque was erected on the north-west corner of Cockburn Island by the Department of Public Works Canada in 1930.

The wreck is now located west of Cockburn Island at a depth of 80 feet.