It takes a few days of travelling through the cave to reach the bird's nest. The cave's entrance is at the bottom of the mountain, and requires plenty of swimming from the travellers. Up we go, following the path, diving in mud and sea water. Once we are stepping on dry rocks, we take a break and lie down on our sleeping bags.
The path grows narrow the further up we travel. Sunlight reaches us through windows in the cave, and through them we can see the green fields that cover the face of the mountain.
We finally reach the nest. It's a hole in the wall, right at the end of the cave's trail. We lie beneath the hole and wait with our photo cameras. When the bird flies out, this will be our chance to capture it on camera. The bird will fly down the passage, towards the entrance, then up into the sky.
It's night time and we better rest. Someone collects everyone's cameras and says they'll be safer in the car's boot; we can collect them again in the morning and patiently wait for the bird to emerge.