Yes...I have measured them. They are around 0.8-0.9VMeasure voltage on each cell. They are likely below 2V per cell. I have same type blue plastic case cells and one bloated like that too. It was left sitting disconnected for a year and self discharged to 0.3V. Looks like same thing happened to your cells. In the future use some kind of battery trickle charger to keep them at 3.35 V per cell. Small 10W solar panel with linear regulator should work.
Is there a way I can recharge them back to 2V to bring them to life ?