in the last of our series on affordable housing, anna holligan reports from the netherlands. below sea level. the dutch have spent decades developing new ways to incorporate this excess water into their style of living. iberg lies just a few kilometers outside amsterdam city center. it's the first time that floating homes have been built on this scale. iberg represents the relatively affordable expansion of amsterdam. one of europe's fastest growing cities. the houses are built on concrete tanks and attached to poles in the water the stop them from floating away. each one of these properties costs around half that of an equivalent home in central amsterdam. >> in most major cities, half of even more of the value of the home is the land. so when you have the water or the land more or less for free, in the end, it becomes cheaper. >> reporter: and the production methods save time and money, too. >> we used to build custom built floating homes. and this is the first real project for floating homes that means repetition. so in a factory, when you have repetition, it means efficie

now, we can go live to the hague to our correspondent anna holligan.ollowing this case for an awful long time, because it has been going an awful long time. why after all of these years has it now been dropped? >> reporter: because the prosecution simply couldn't find sufficient evidence to justify going ahead with this trial. it can't really be overstated how much of a blow this is to the prosecutor. it's been her most precious and high-profile trial. also the most frustrating. we've just had a statement from the prosecutor at the icc, and she talks about attempts to frustrate her investigation. she says there has been a steady and relentless stream of false media reports about the kenya cases. an unprecedented campaign on social yesterday to expose the identity of witnesses. and a concerted and wide ranging effort to harass, intimidate, and threaten individuals who would wish to be witnesses. and that's been one of the main frustrations for the prosecution is the fact that the witnesses have one by one disappeared from this case. they haven't been ab