If the tube cracks in any point, just the water (I guess) will go sucked into the tube, where almost instantly will become solid ice, due to the reduced pressure within it.
This would happen, of course, if the water were at near 0? C.
I've seen these same phenomenon in mineral gasified (soda) water bottles that have been into the freezer at 0? C.
When the bottle are tight closed, the inner pressure (about 2 atm.) does not allow the water could be frozen, but when the bottle are opened, its inner pressure equals those of the outer atmosphere, giving as a result that the water begins to cristalyze until the whole mass are turned to a solid block of ice.
But please, if I'm wrong, please, tell me.
Regards.