it's been shown in videos that once the cessna wheels contact the water the aircraft immediatey 'FLIPS'noses over..
Remember the 206 amphib wheels down.
This has raised the current issue by TSB regarding poor egress from sinking floatplanes..
The general method is to contact the water level if poss'plonk it in'-you stay upright..Don't forget that if it's rear doored(206)the flaps interfer with th
e doors opening-so open the doors prior to flap extension
cheers