After 22 years, hundreds of astronauts from 20 different countries and countless scientific advances, the ISS will be decommissioned by the end of the decade.
The British government also took ages to clarify how the costs of decommissioning rigs will be divided, discouraging new entrants from buying elderly fields.
Helium-3 is only produced when the tritium in a nuclear bomb decays, and since we're decommissioning more and more nuclear bombs, we're running out of helium-3.