The swimming competition was held in the open sea. Nearly 20,000 spectators lined the Bay of Zea off the Piraeus coast to watch the events. The water in the bay was cold, and the competitors suffered during their races. There were three open events (men's 100 metre freestyle, men's 500 metre freestyle, and men's 1200 metre freestyle), in addition to a special event open only to Greek sailors, all of which were held on the same day (April 11).