HMAS Sirius (O 266) (formerly MT Delos) is a commercial tanker purchased by the Royal Australian Navy and converted into a fleet replenishment vessel to replace HMAS Westralia. She is named in honor of HMS Sirius of the First Fleet. Launched in South Korea on 2004, and converted in Western Australia, Sirius was commissioned in 2006; three years before a purpose-built vessel would have been built, and at half the cost. The tanker is expected to remain in service until the 2020s.
Delos was built at Hyundai Mipo Dockyard in South Korea. Another five ships were built to the same design, all for civilian service. She was launched on 12 April 2004, and was purchased by the Australian Government on 3 June 2004 and handed over from Hyundai on 16 June 2004, with the intention of modifying her as a replacement for HMAS Westralia. Delos was leased (bareboat charter) to Teekay Shipping for operation as an commercial oil tanker until September 2005, then was taken up by Tenix Defence (which had been awarded the A$60 million conversion contract on 15 March 2005) for conversion into a replenishment vessel, which was completed 5 weeks ahead of schedule. Sirius was commissioned into the RAN on 16 September 2006, in a ceremony that included Westralia's decommissioning. While HMAS Sirius is the first ship of this name to serve as part of the RAN, she is named after HMS Sirius, the flagship of the First Fleet of British convicts sent to Australia in 1788.
As a Letterbox Hybrid cache, you will find a logbook AND a Stamp. The stamp is not a trade item but intended to stay within the cache. Use it to stamp your own notebook, and stamp the logbook with your own personal stamp, OR alternatively, simply date and sign the logbook as you would normally do at any other geocache. Again, the stamp and logbook remain in the letterbox for the next visitor to use.