A splicer for Con Edison was seriously burned when an explosion occured inside the manhole he was working in at East 68th Street and York Avenue. Eugene Pearson had been repairing a cable when another cable caught fire, causing a "blast and...cloud of yellow smoke," according to the NY Post. Pearson was pulled to safety by another worker, and was treated for third degree burns.
Other manhole explosions have occured when no one is working under them: explosions on the Upper East Side last month and an incident in Midtown that shattered windows.
Photograph from WNBC 4