1. We sat and watched millions of bats stream out of Deer Cave , they fly as far away as the coast to gorge themselves on 15 tons of insects.

2. Adventure Caving in Mulu is so exciting, exploring deep underground with just a torch to show you the way. I envied how easily the bats found their way around in the pitch black.

3. It is so big – the largest cave passage in the World. As we walked around Deer Cave, 100 metre columns of water fell to the floor and a huge underground river roared beneath our feet.

4. Climbing was such as a challenge but the view of the 40 metre high Pinnacles was an amazing reward. I didn't believe them when they said going back down would be the hardest!