Our fellow fans at The Allspark
have posted a translation of the eighth chapter of the Transformers United EX story. Story chapter 8, Ocean Encounter, comes on the back of the Tankmaster VS Marinemaster box and returns the action to Grimmaster's battle where evidently he managed to triumph over the near-immortal Roadmaster. Tankmaster's arrival turns the tide of battle, and only the arrival of Marinemaster is able to save Grimmaster. The overall plot progresses as well with the beginnings of the High Regent's plot coming together, and the reveal that some within the Decepticons - like Tankmaster - do not follow him.
This chapter clears up the identity of Marinemaster, who as his design suggests, is the Generation 2 Autobot Manta Ray. Tankmaster is a bit harder to divine from the story chapter - the Allspark has it on good authority though that he is a new incarnation of Simon Furman's character Grindcore, from the IDW Revelations miniseries.
Click here to check out the full translation at The Allspark.