 Groundbreaking for the third rink expansion at South Bend's Icebox is planned for 11.30 a.m. today, indoors on the ice. The $12 million expansion comes just in time for the 50th anniversary of the popular skating rink on South Walnut Street, which plays host to area hockey teams and more. Attending the event will be Mayor James Mueller, members of the Icebox board, South Bend Regional Chamber President Jeff Ray, and others.