when the cops have cut a hole in the tube they will reach in and unclip your carrabiners or cut through bonds - at this point it is useful for blockaders to pull against each other to tighten carrabiners against each other to make it difficult for cops to unhook them - and if you have another tube of stronger or different material inside the plastic one they have to get other cutting equipment which takes time - and if your carrabiners are connected to your arms by chain link or other material harder to cut then that also takes time

happy blockading