Right well here are the photos:

This is the entrance to the tunnels, as you can see it is quite heavily cemented, more on that later. The girder in the front is actually to hold the cement, I read on 28 days later that one person thought it was the top of the entrance, I dont think so, the whole cutting into the rock is the entrance imho.

This is the hole that "may" be breachable. I think this is the only chance anyone really has of getting in because the cement is extremely well done.
I had a closer view of the hole, and the door can be seen. I kinda think the black bit is the door.

This is a shot to give you some ideal of how well cemented is it. I have placed my phone (Siemens S25, so its not dead small or anything) on the cement to give some perspective. I did try a cola bottle but it wouldnt stay stood up.

Another shot to give some perspective on the cementing. Again my phone is in the shot, almost in the centre of the shot. You can see clearly how much cement they used.

This shot is standing on top of the cement looking downwards, again my phone is in the photo for perspective. Again, you can see they have used a massive amount of cement. You may also notice that there is a steel girder within the concrete, in reference to my point earlier that the girder in front is to hold the cement in place.

The hole with a Coca Cola bottle in the way to give some perspective of the size of the hole.

Another shot with the Coca Cola bottle to give perspective against the size of the hole. You can see that a normal sized person would be able to squeeze through, its actually quite big. Whoever started this hole certainly intended to break through.

Another shot from further back, it looks a bit of a mess on photos but its not so scrappy when you are there.

Another shot of the whole thing, this time from the right angle, you can see the hole is quite big again.