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According to my friend's uncle, another team came and did works on that hole, for some reason adding some type of stair or ladder on its walls in a to reach its bottom.

What he and his team were was to build a tunnel exit that led to the strange chamber the floodwaters had carved out.

This exit was to be unmarked.

The unmarked exit is said to be in the tunnel between M... station and .
It's not hidden, either. An emergency exit is meant to be seen in the dark. It glows in the tunnel, and when you're on the train heading clockwise and stand on the right side of the carriage, looking out, you may catch a glimpse of it for a split second.
I see it every day.
The path for the new intersects perfectly with where this abyss is said to be.
The line and its tunnel are set to open in 2025.