Pedzisa mutsara unotevera: Muna 2007, Gamm akawana mwaka wake wokutanga mukudonha, apo iye nomukwanyina wake Subschinski vakawana menduru yendarira nokuda kwechirango chimwe chetecho paFINA World Championships muMelbourne, Australia, vachiunganidza chiverengero chamapoinzi 306.63. Pa
2008 European Aquatics Championships muEindhoven, Netherlands, Gamm akabata menduru yake yechina yegoridhe yakateedzana (yekutanga ichiitwa muna 2002), pamwe chete nemumwe wake Subschinski, mumadzimai akabatanidzwa, aine huwandu hwese hwe336.63.