Crashed into a shallow river, possibly after hitting wires.  4 POB rescued OK.  Even if the helicopter survived in a rebuildable state, the locals manage to pull it apart sufficiently in this video that it is most unlikely to be rebuilt.  This tweet claims it was unregistered.  The occupants were all from Frabelle Fishing, a Filipino company

Date:

22 May, 2015

Make:

Robinson

Model:

R44

Location:

Bumbu River, nr Lae

Country:

Papua New Guinea

Civil / Military:

Civil

Operator:

Frabelle-Fishing

Link:

http://www.emtv.com.pg/article.aspx?slug=Helicopter-Crashes-into-Bumbu-River-&

Link:

http://www.pngloop.com/2015/05/23/helicopter-crash-lae/