Another on2 TommyKnocker is officially on its way to Dubreuilville, Ontario. This TK1 was custom designed for Richmont Island Gold Mine. It is the largest chamber we have ever built at 24 feet long and is has an occupancy capacity of 20 persons. This TK1 was designed, built and shipped in a record 4 weeks from the day we received the PO. ON2 is committed to providing Reliable SOLUTIONS FAST!