[Roaring, rushing noises]
People: Whoa. Whoa. That's bad.
[Announcer] It's Sunday, and the side of a mountain has just collapsed.
It crashes through the river that
runs through the Rhondda Var, near [?] town.
Nobody is injured, but it's only today
the sheer scale of that collapse is obvious.
Something else that is clear
is the amount of coal
that was still on this mountainside.
Gerald watched it all happen.
[Gerald] There was a roar,
and you could see the muck slip from the top area, there.
Within a couple of hours, the whole lot had come down there.
[Announcer] Do you feel vulnerable?
[Gerald] Yeah. Yeah. With this going on, yeah.
These valleys are surrounded by coal.
They were built on coal.
It's a frightening prospect, you know.
If that could've happened
on this side of the mountain,
it would be a totally different outcome.
[Announcer] His father Cliff is a former miner.
You look at this landslide now, what goes through your mind?
[Mr. Durham] Aberfan.
Believe me, we don't want to see that again.
I wouldn't.
[Announcer] I've been speaking to people
on this street.
It's Bryn Hailog, and it's opposite to the landslide.
They described yesterday as eerie.
The sound of slurry crashing down the mountain.
They are just thankful that this happened
in front of their homes,
not behind them.
The greenery of the valleys
disguises the amount of coal that is still hidden here.
In the 1970s, 80s and 90s,
the land was reclaimed.
But now, there are calls by local people,
to inspect all the areas where coal was dumped.
[Chris Bryant] We should definitely
be inspecting all the former coal tips.
Making sure that if there is excessive water in there,
that that is being drained off,
make sure everything is safe.
Because obviously, people have seen the horrific pictures
on television news, of what's happened in Ponte Guy.
People might not have seen it for themselves.
It is much bigger than it looked on television.
So, people are, of course, worried.
It is one thing, having water coming,
coursing through your house.
It is quite another, having, um,
slurry, and the top of the mountain
coming down through your house.
[Announcer] But, who is responsible?
Who owns the land?
The Coal Authority says, it's not them.
The Councils say,
they're not sure if they do.
Who is responsible for these sites,
and who is maintaining them?
[Andrew Morgan] At present,
we are in discussion with