An arsenal of dangerous weapons including a modified machine gun, semi-automatic shotgun, handguns, dozens of knives and swords, and an armoured personnel carrier have been found on the property of the man accused of dumping up to 19 million litres of toxic waste in Melbourne's northern suburbs.

A police raid on the Wallan home of Graham Leslie White in July 2018 uncovered the cache of loaded illegal firearms in a carpeted, purpose-made space hidden behind a false wall of shelves in his bathroom.

Accused toxic dumper Graham Leslie White was found with a cache of loaded illegal weapons and an armoured personnel carrier in his backyard. Credit:Chris Hopkins, Jamie Brown

Many of the weapons, including an ArmaLite AR-10 assault rifle retrofitted to fire as a machine gun, were found loaded and with the serial numbers removed. A loaded handgun was hidden under his bed.

Elsewhere inside the home – which had been decorated with props bought from the now defunct Dracula's Cabaret Restaurant in Carlton – police found nearly 50 bladed weapons, a spiked wooden club, a crossbow and dozens of imitation firearms displayed on the walls of several rooms.