limdul

I am having an issue with seeing the coolant container on the Obsidian Island. I did conquer the island but did not have a hook on a manta. While a hook was being built I decided to go conquer some other islands. Now that I have come back to the island the coolant is no longer there. I do not have a saved game back at the point of taking over Obsidian Island so I cannot reload that. I am using the steam version of the game. I would like to know how to get the coolant back so I can continue forward in the campaign.