Plenty is revealed in this conclusion to the series, as the saboteurs are identified, and ironically, more than one country is involved in the troubles.   
 
The biological weapon virus that infected one of the crew members is in danger of being released to the world at large, so the remaining crew members not only have to find a way to survive the flooded underwater set, but also find those responsible for the terror.   
 
Add to all the chaos, the infected crew member is on the loose in a crazed state and Rachel and the survivors do what they can to battle and stay alive using the movie costumes, props, and FX they have.