The stricken cargo ship Rena has remained intact overnight but it is not yet known what further damage has been caused.

Maritime New Zealand says crew on board the Go Canopus and motion sensors on board the Rena have confirmed the Rena is still afloat.

The grounded Rena is still intact despite rough sea swells overnight. Photo: Maritime New Zealand.

Conditions around the ship, grounded on Astrolabe Reef, remain poor with three metre sea swells and winds of around 29 knots.

A MNZ spokesperson says they are now waiting for full daylight to determine if there has been further damage to the ship.

'We have no information about the status of the containers on board the vessel at this point, or whether any fresh oil has been released.

'It is important to note that the full extent of the impact of the current bad weather on Rena will not be known until we have full daylight and the salvage team is able to make an assessment. This may take some time as visibility is poor and conditions could make it difficult to undertake aerial observation.”

The crew on board the Go Canopus will also be reporting on the condition of the vessel.

Keep checking SunLive for more details.