The Tomorrow People (1973) - 4x06 - Into the Unknown, Part 3: The Tunnel- Followmy.tv

As the shuttlecraft enters the hole, the temperature inside begins to drop. Timus arrives at the Lab and boosts Tim's power, enabling him to locate the shuttlecraft in the hole, but the picture fades as the shuttle goes out of range, and Timus is recalled to the Galactic Federation to report. Another hole appears directly in front of the shuttlecraft, and the Tomorrow People notice that their watches have stopped, despite their being in the hole for seven or eight hours. The shuttlecraft slows down and the reactors begin working again.