The Giant Gippsland Earthworm is found in Gippsland in south-eastern Australia, burrowing in the soil where there is lots of water to help them breathe. These burrows can be right at the surface to over a metre (over 3 feet) deep.
They produce huge egg cocoons which have to be left for a whole year before a baby is ready to emerge. This baby will already be about 20 cm long, which for me would be a noteworthy size for an adult if I came across it. But it's not an adult, it's a newborn.
It will take this youngster a further 5 years or so before it reaches maturity. By now it will be more like a metre long, but one must remember that earthworms can stretch and contract their bodies. Indeed, it's how they get around! This makes the simple question of 'length' a rather complicated affair.
Despite this extravagant size, or (being an earthworm) perhaps because of it, the Gippsland Giant is very peaceful and very fragile. They can be killed by too much handling and can only survive in a particular soil type with nearby water.
Walking over their property will send vibrations down into their burrows. They respond by crawling about and making audible squelchy sounds that emanate from below. This is not normal.
Not much is known about these giant softies since they very seldom go to the surface. It seems like they mate in their burrows after finding each other somehow. No doubt they make audible squelchy noises.