1.   The white dirigible, which appeared to have a surveillance camera attached to it, hovered several hundred feet above the square on a tether line.

2.   At another point, the president and other hostages are whooshed one by one to another U.S. plane by sliding along a solitary tether line.

3.   Before Thomas went up to the solar wings, his safety tether line got tangled up and he had to be helped by Richards.

4.   Because of the threat that tether lines could break, NASA decided to update their security system for astronauts making space walks.