Tug BLUE DRAGON 12 suffered explosion and subsequently, sank, in the afternoon Jul 23 in Semoi Setawir, Sungai Sepaku river, upstream from Balikpapan, Eastern Kalimantan Makassar Strait, Indonesia. Of 12 people on board, 4 suffered burns (their condition unknown), 1 went missing, 7 escaped. The tug was waiting for barge Sea Dragon 2712 to be loaded with coal. There were wielding works taking place in stern area, shortly after works started an explosion came about.

Source: https://www.news2sea.com/tug-sank-after-explosion-4-burnt-1-missing-indonesia-tb-blue-dragon-12/