Thieves who stole thousands of dollars worth of important search and rescue equipment from Coastguard Hawke's Bay threw the boat's door in the sea before leaving.
The Coastguard first realised something was amiss when the crew were about to take off for their usual Sunday training session, skipper Henry van Tuel said.
They were called about a trespass notice the day before, but the boat had seemed secure at a first glance.
"Somebody I know rang me on Saturday and told me he had seen people jumping on our boat," van Tuel said.
The boat is covered by security cameras and van Tuel said the footage had captured a group of people entering the boat, taking items away and throwing door into the sea on Friday, January 18.