Re: 'Without life rafts'
Perhaps, but usually when such a situation occurs, search craft start tracing the plane's flight path to look for something nice, bright, and large like the escape chute life raft. Once it's located, they can coordinate with other craft to drop supplies as needed and/or contact nearby shipping. The only reason crash searches have taken so long lately is because, like I said, the crashes were not of a survivable nature and the end result was a traceless crash: no life rafts or the like to find.
I may be wrong, but don't most life rafts also carry EPIRB that start broadcasting when they're deployed, allowing for a quicker search (and again, weren't deployed with all the sea crashes to date)?