Going through the ice....
One of the best ways to be safe is work out safety routines and then to practice - if possible. As skaters we ofter talk through safety issues and one technique recommended (a few years ago) by a skating old timer was to hook your foot onto the good ice and roll out of the ice hole thus spreading your weight across the surface. Dave P has a practice (in the video below). This practice highlighted to usefulness of ice claws (which we did not have with us on this day) to help grip the ice.
Ice Claws - >>>>