The aquanauts

"Fifteen-year-old Greta Kovachi travels with her brilliant father to a laboratory habitat in a submarine on the bottom of the Pacific Ocean. Her father has created the first man-made black hole to prove that all matter in the universe is made up of infinitesimal particles of time."
". What was supposed to be a trip of a few days turns into a nightmare when an accident with the black hole spins them billions of years into the future, trapping her dad along with the other scientists in a particle of time. Three other kids live on the habitat, and, calling themselves the Aquanauts, they band together with Greta to travel through layers of time in a frantic attempt to save their parents and themselves from being locked under the sea for eternity."