Dive researcher deems cost to right wreck 'astronomical'
It follows ongoing criticism of the scuttling of the ex-navy ship
Ex-HMAS Tobruk questions go to parliament
It's a predicament which has left some dive operators concerned
A political war of words has erupted over the ex-Navy vessel
Opinions are divided as to whether tourism will be affected
The ship was flooded with water and submerged in about 30 minutes
The Tobruk descended into the deep last week