Help! Bunnies digging obsessively!

[buddyfingy]

I have two house bunnies, male and female who are neutered. They are probably just over a year old now and they have discovered how to dig in the last month. Obsessively.
I have tried absolutely everything i can think of; digging mats (two types), a playpen with a toughened fabric base (have just today gone through that), made every conceivable kind of toy that I can think of to act as boredom breakers, and still they dig!
Living outside is not possible as I am in a flat and when they aren't threatening my sanity with the digging they are wonderful little horrors and are very sweet companions.
What am I missing? Are they going through the bunny teenage years and will grow out of it? What can I do to keep them more entertained when I am not around to supervise? All suggestions welcome please!

You are doing everything right. Some are just more into digging than others. My Current Bun is a digger and we do have a couple of balding patches of carpet as a result. Previous Bun was not overly interested in digging but she was a chewer.

I did manage to curtail Previous Bun's inappropriate chewing by spraying her with water - she soon got the message. This could work when yours dig in the wrong places. Some people provide a box with sand in for digging so that could be worth a try but you'd probably just end up with sand everywhere. Sorry not be more helpful. Rabbits are lovely but they can be very naughty.

Thanks FernieB. The main problem with my two is that they are responsive to being told ''n

Oops!! They are responsive to being told 'no!' (Well one is but the other is deaf) the problem is when I am not around! I am glad I am not doing anything wrong though...maybe I should go back to clicker training! That did seem to keep their little minds busy - well obviously not Deaf Bun, he just enjoyed hoovering up the 'rewards'

But diggings what we bunnies do (when we aren't star gazing or watching tennis)

Ooo don't I know it starball I am just looking for more inventive ways to keep their minds off it, I would hate to think that they are doing it through boredom. I don't know if DP will allow me a box of sand in the front room and I dread to think what colour Little White Deaf Bun will go! I'm thinking a pinky reddy sand colour!

They do generally seem to get less energetic as they get older. My previous bun would regularly 'disappear' and after a long search would be found scampering around in the cellar or under the covers of DDs bed (up 2 flights of stairs in our old house). She calmed down when she was about 2 and was content to potter about near me or lie by the radiator for most of the day and just have a mad half hour of binkying in the evening. Current Bun is much the same. He was a live wire and now at nearly 3 has calmed down a bit and is asleep for most of the day.