The first seems clear enough to me, idk. The third I think is using the nasal 'ng' rather than a hard 'g' (or they just had a cold when they recorded...? )
You hear the nasal 'ng' mostly with が not so much with ぎ but both hard-g and 'ng' map to the が-row in japanese phonetics. Wikipedia even gives かぎ as an example of a Japanese word using this sound in some accents, Voiced velar nasal - Wikipedia