John Wagner/News-Miner.Instructor Zac Kassel, center, speaks with young swimmers about the importance of staying close together in an emergency situation to conserve body heat Thursday evening, April 9, 2009, during lessons at Hamme Pool. The summer closure of Hamme Pool will leave the Mary Siah Recreation Center and the Wescott Pool in North Pole as the only two public pools offering swimming lessons in the Fairbanks North Star Borough