Hugo’s password is
October First is too late
From Fred Hoyle’s great book.
In the Traveler in Black and White, Saku gives Hugo (Lord Mariusz) a password, in case he gets stuck on the other side of the time tunnel and has to come back overland. I chose “October the First is Too Late”. It is the title one of my all-time favourite books, and is kind of about time travel… although not quite. You should read it, although it is hard to find. Click the link on Amazon asking for it on Kindle! (Search links for UK and on .com)
I should re-read it and review it properly of course.