Two Victoria Police officers who used a $650,000 counter-terrorism boat to reach a remote surfing spot near Point Nepean last week have been disciplined.

The officers are suspected of using the boat to access the surf at Corsair Rock after completing a joint Water Police-Special Operations Group training exercise last Thursday.

The almost mythical left-hand break, also called Quarantines or "Quarras", is only accessible by boat. It is hundreds of metres offshore and near the treacherous stretch of water known as "The Rip", at Port Phillip Heads.

It is understood the rigid hull inflatable boat, commonly used for counter-terrorism and high-profile exercises, was taken out to the break. Corsair Rock is one of Victoria's most prominent shipwreck spots.