Magical Girl Lyrical Nanoha

The last of the terrorists are secured, and Vivio is back to her normal self. Chrono's fleet prepares to destroy the Yurikago. Unfortunately for Nanoha and Hayate, Yurikago goes into self-destruct mode, while locking them in with anti-magic fields and heavy blast doors. Meanwhile, Fate finishes off her work in Scaglietti's lab, just as the whole place starts to cave in. It's a race against time for the Forwards to rescue their mentors. How will it all end?