| Q4 2017 | Q4 2016 | |
| Revenue | $235.9m | $154.1m |
| Operating costs | $395.1m | $246.6m |
| Net loss | $194.8m | $156.1m |
Norwegian seismic survey vessel player Petroleum Geo-Services (PGS) has fallen to a bigger fourth quarter loss as expenses rose.
The owner said the net deficit to 31 December was $194.8m, from $156.1m in 2016.
Revenue rose to $235.9m against $154.1m, but operating costs were $395.1m, partly due to impairments, compared to $246.6m
