Press Release – Waikato Regional Council Waikato Regional Council staff have set up booms around the site of a sunken vessel on the Coromandel Peninsula to prevent any further spread of diesel. Its understood 2000 litres of diesel was on board the 47-foot fibreglass launch that caught fire … Waikato Regional Council staff have set up booms around the site of a sunken vessel on the Coromandel Peninsula to prevent any further spread of diesel. It’s understood 2000 litres of diesel was on board the 47-foot fibreglass launch that caught fire and sunk in the early hours of this morning in Woolshed Bay, Whanganui Island.