Hilldiggers

During a war between two planets in the same solar system - occupied by adapted humans - what is thought to be a cosmic superstring is discovered. After being cut, this object collapses into four cylindrical pieces, each about the size of a tube train. Each is densely packed with either alien technology or some kind of life. They are placed for safety in three ozark cylinders of a massively secure space station. There a female research scientist subsequently falls pregnant, and gives birth to quads. Then she commits suicide - but why?