Mainland scientists have discovered a "super material" that is as light as a balloon yet as strong as metal, which could be developed by the mainland's military into armour that protects troops ...

Art Thompson:There's a series of nylon strings that run through that balloon material to be able to carry the weight. 801:01:26:02 01:01:31:20Narrator:As the balloon climbs, the helium expands ...

Both untreated latex and foil balloons are not airtight. They both have tiny microscopic holes within the material itself. If the gas molecules inside the balloon are smaller than the holes in the ...

However, the photos reveal the piles of balloon material were able to be pulled aboard by hand. The US military has also deployed unmanned underwater vehicles as part of the search effort.

"The model also works backwards - called back trajectory - where we can see where anything carried in the air such as pollutants, ash or other material has come from. "In the case of the balloon ...