Today at around 1:50 pm, there was a manhole cover explosion on Folsom Street at Harriet Street. Alert SF notes: "Folsom Street is closed between 6th and 7th Streets. Harriet Street is closed between Howard and Harrison Streets. Please avoid the area."
Power in the area has also been affected, with outages hitting Sixth and Seventh Streets between Harrison and Howard.
Update: Power has since been restored. CBS 5 reports that firefighter, "fought the blaze by applying carbon dioxide, which essentially “smothers” the fire without damaging the underground electrical equipment."
Please post your finest "manhole-SoMa" jokes in the comments.