Mysteries of Singapore

 Singapore is a small island.

Yet, there are some... mysteries.

From the comments on the video:

1:22 Ironically, this was also a Singtel radio transmission station. They used to have a sign for it that you can see from the main road. They was also a tall radio tower that you can see in the middle of the field. IIRC there used to also be a big singtel logo that you can see on the top of the grey building you pointed out in your video (somehow that was removed already).

2:10 likely yes; the area was known as Boh Sua Tian before it got cleared for the SLE/CTE/TPE junction, and was named after a Royal Air Force transmitter nearby (无线电). though I’m not sure if the tower that got demolished was still the original one.

5:30 it’s a stormwater retention pond built by the JTC and completed in 2022. an unusual aspect of it is that it uses no pumps but instead relies on percolation into the ground, thanks to that bit of Jurong Island being made of sand.

7:44 this object is a VOR (a navigational aid for pilots). It is used to help pilots land at Paya Lebar AB. Notice how it also falls in line with the Paya Lebar runway. There are similar structures around airbases and there is one in Tekong Kexchil also to help pilots land at Changi Airport.