Well, here is an amazing tale of survival involving a Sony handset. Sony was actually one of the first smartphone manufacturers to run with the idea of waterproofing its handsets.
And the end of this story proves that they have become very good at it. At CES 2013, the Sony Xperia Z had a display that showed off the waterproofing of the phone. The Sony Xperia Z2 is even certified to withstand a submersion in water to as deep as 5 feet, for as long as 30 minutes. That is fresh water, mind you.
Alexander Maxén from Gothenburg, Sweden, was waterskiing while on vacation. He had left his Sony Xperia Z2 on the seat of the boat. So once the craft started cutting through the waves, the phone fell into the deep. The sea bed was more than 10 meters deep, so trying to recover the device was just not practical.
Once they were back on dry land, Alexander called the phone, which continued to ring, proving that it was still working. Because otherwise it would have gone directly to voicemail. So fast forward to six weeks later, when a friend of Alexander’s went scuba diving and retrieved the Xperia Z2.
What they found was that the back glass was shattered and the battery had completely discharged. The LED indicator did light up when the phone was plugged in. And once it was recharged, the phone worked perfectly, even able to still make phone calls. That’s a pretty amazing bit of engineering right there.
Source Phone Arena