Which slides didn't deploy?
According to this report
Schapelle Corby's boyfriend Ben Panangian was at plane crash scene, helped rescue passengers | News.com.au
"She told News Limited she thought she was going to drown because almost immediately after impact, water started rushing in from the floor of the plane.
Her seat was near where it broke in two.
At first she struggled to free herself and was bleeding heavily from her right leg, but eventually she got out.
She explained none of the rubber slides meant to open after a crash landing had done so. Passengers were forced to jump into the water and swim to safety. "
Some photos suggest forward starboard slide /chute deployed, but I haven't seen evidence of the other three. Passenger descriptions of being rescued in rubber dinghies seem to refer to actual rubber dinghies being used by local surfers.