Abandoned grade 2 historical red brick cottage

Hi

Earlier this year , Hong Kong front post made an artical about an abandoned red brick cottage which is grade 2 historical building 

I tried copy and paste the link but it always logs 

so if you just google hkfp abandoned cottage , it takes you to the article 

The cottage was built around 1906. Seemingly in the woods, the article also mentioned there is a cliff with sealed air raid tunnel behind this cottage . The structures around this cottage were recently refurbished but not this graded historical building . The location is also near one of the oldest Protestant churches . Given so much information in the article I can't quite figure this out. Hopefully you guys could help

much appreciated