The Sungai Lembing Museum is located about 40 km from Kuantan or about 30 km from East Cost Expressway Kuantan exit.
The museum is a former underground tin mines. Part of it is open as a museum.
Nothing much to say except it is one of the best museum in Malaysia. It have both static and interactive display.
The tunnels itself is well ventilated and adequately lid. But a pair of sport shoe will help you to explore 600 metre of underground tunnel or 1.2 km return.