How did they contain that red matter?
That mysterious "red matter" goo the Vulcans created? If one spot of it could create a blackhole how could they even control it at all? Wouldn't it form a blackhole right in the laboratory?
And how did they know that a blackhole created would allow time travel (of all things)? Why wouldn't they think it would simply crush any space ship foolish enough to enter the blackhole (like it did with the planet Vulcan)?