What caused Sunway Lagoon's rollercoaster accident?

What the heaven is metal fatigue?

Jeffrey Cheah says it may have played a role in the Sunway Lagoon roller coaster accident — even though the ride had reportedly undergone inspection and maintenance just weeks earlier.

Here’s how metal fatigue actually works, and why it isn’t always easy to spot.

The investigation is still ongoing, so we don’t really know what happened yet.