Thanks "skadi" for that link.
World's only three Abyss submarines sent to Indian Ocean for plane search - Telegraph
It may explain why HMAS Toowoomba is making turns for her published maximum speed.
As shown on Marine Traffic she appears to be headed for Exmouth/Learmonth on Australia's North West Cape. Exmouth has a port and Learmonth is is a joint user facility with a runway (3,047m) suitable for large airplanes.
Live Ships Map - AIS - Vessel Traffic and Positions - AIS Marine Traffic