Terowongan Pengelak Bendungan Tapin, 12 Sept 2017, total panjang terowongan 360 m, blasting sdh tembus 358.5 m, sisa 1.5 m breakthrough.
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Terowongan Pengelak Bendungan Tapin, 12 Sept 2017, total panjang terowongan 360 m, blasting sdh tembus 358.5 m, sisa 1.5 m breakthrough.