Tyre experts?

[Andy325i]

Got my sister to take a couple of wheels to the tyre shop today as they were leaking around the edge of the alloy and hence going flat in a couple of days

So they take them off and tell her the tyres are shredded on the inside.

How would they get like this? I can see the state of tyre 2 on the outside is past its best and tyre one has had a plug repair at some point, but how would they fill with the tyre "shreds"?
Here are the tyres


Tyre 1







Tyre 2

[adamt93]

It means it's been run too flat for the tyre it could do it on something stuped like 20psi you just have to be cearfull mate when they have a leak

[DanThe]

Whats happening is the inner side wall is being churned up because they have been run at too low a pressure, they look very old too, I wouldnt want them on anything id be driving fast in

[Andy325i]

Thank you people Now binned, just need to find some more