This is the last of four "interactive" caches in Kei Ling Ha Lo Wai, Sai Kung.
All four caches are on-site puzzle caches with a twist! The cache is at the posted coordinates, but you will not be able to retrieve it without performing some tasks first.
Combining the best of geocaching with the traditional treasure hunt using a map, these caches should provide a challenge for all types of cachers!
The 4th and final cache is located at the Kei Ling Ha Lowland Pumping Station.
This station is part of an extremely elaborate system of tunnels, pipelines, canals, intakes, dams and pumps that feeds rain water into the High Island Reservoir.
This is the most difficult of the four caches due to terrain and the requirement for more stealth.
Teamwork for this cache is not required, but it is highly recommended!
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Here is your mission:
1. Even though the cache is at the posted coordinates, it should not be visible!
2. Locate the Map.
20 metres NW of the cache coordinates you will find this sign:
Close to it is a blue metal plate. Behind it is a map. Grab the Map.
3. Locate the "Raising Device".
Use the map to locate the "Raising Device".
Go there and release the cache. (Details on the back of the Map).
The cache should now be visible.
4. Locate the Retrieval Tool.
Again, using the map, locate the "Retrieval Tool" and grab it.
5. Grab the Cache.
Use the Retrieval Tool to retrieve the cache!!
There is a small hook near the cache to hook it onto while you sign the log.
6. Rehide the cache.
Instructions are on the back of the Map.
7. Replace the Retrieval Tool.
8. Replace the Map.
Congratulations, you solved the 4th and final puzzle!!! 
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NOTE: DO NOT UNDER ANY CIRCUMSTANCES climb into the reservoir!! Apart from being illegal, it can also be dangerous due to unexpected flooding!! You should be able to retrieve the cache WITHOUT climbing in the reservoir.
During rainy season you will likely have to walk through some muddy patches to get to the "Raising Device".
Your hands will get dirty when opening the cache container!! 