It's ten years since the container ship Rena smashed into Astrolabe Reef off Tauranga, causing New Zealand's worst ever environmental disaster. 

Hundreds of tonnes of oil and cargo were spilled and kilometres of coastline was polluted. 

In the decade since, researchers have been monitoring the effects. 

Marine ecologist at Waikato University Dr Phil Ross has done hundreds of dives onto the wreck. 

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