**** SPOILER WARNING ****
Given that Bond and Noni arrived on the island in that super-duper state-of-the-art sub-aquatic stealth-plane which they conveniently parked in a secret little cave - why didn't Bond just escape in that ?
I'm sure Q would've sourced a vaccine from Astrazeneca or something for his viral issues soon enough.
Did they explain why he couldnt just use his watch to destroy the nanobots?