extraordinary volumes

Did anyone else find today's volume traded interesting?

About 18 million went through at 4.10 pm, so my comsec account reports, at a price of 2c a share. That was just 2 trades. Now plenty more wen through, 22 million in total.

Now ANZ owns what 118 million, which is say 25%. Back of the envelope calc tells me market cap is therefore 472 million. Lets say, as an absolutely rough calculation, that after 4pm today, 5% of the company changed hands.

Nice little deal has been done, any ideas as to what/when/where/how?

All speculations welcome!