2011 Event North Korea raises concerns regarding nuclear testing; reports show they have dug tunnels at a nuclear test site located in Punggye-ri, North Hamgyong Province 1993 Event Arab terror group planning bombing of Holland/Lincoln Tunnels caught 1992 Event Great Chicago Flood - Chicago's underground tunnels flood 1957 Event Dutch Queen Juliana opens Velser Tunnels 1864 Event Petersburg Campaign-Federals begin digging tunnels under Reb lines 1830 Birthday Adolph Sutro, San Francisco mayor, built Cliff House, railways, tunnels
