Any idea what animal caused this?

[imageel]

Some years back I had an old flat roof extension demolished and they guy doing it had neatly stacked the quite chunky 190mm x 60mm x 4.2m long beams onto some bearers onto a concrete hardstanding.
I knew a lot had some rot at the ends and today I went to chop them into 1.4m lengths to load into my car and take down the dump.
After processing 3 lengths I discovered the rest had been extensively eaten by something quite large.... - Does anyone have an idea as to what kind of pest could do this - I have never seen woodworm this large!

 

[Doug B]

Some woodworm can be big, I’ve got timber with holes as big as those in your photo, google longhorn beetle

 

[sawdustandwax]

Carpenter bees

 

[rogxwhit]

The holes could be from wood wasp larvae. They're partial to softwood. But is that dry rot?

 

[imageel]

Thanks for the replies- yes deffo rot although I think more likely wet than dry.
I was just surprised at the number and size of holes, the amount of wood removed - the lower sections were light, whereas I struggled to lift the upper ones to saw them to size!