??????

Tsukiji Market, best known as where Tokyo's daily seafood intake comes from, has been Tokyo's main fish market since 1935, when it relocated from Nihonbashi in the wake of the Great Kanto Earthquake of 1923.

Soil clean-up work on Toyosu Island for Tokyo's new fish and produce market
However, the Tsukiji district, in Tokyo's Chuo ward, is very close to the upmarket Ginza shopping district and the land there is very high priced. The former governor of Tokyo, Shintaro Ishihara, pressed for the market's move to Toyosu, 2.3 km south-east of Tsukiji, and moves finally got underway to do so, with the relocation originally planned for November 2016, but since postponed.

Toyosu is on land reclaimed 80 years ago, in 1937, and is an industrial zone that was home to a gas plant. Soil and groundwater testing revealed that about 36% of the surface soil on Toyosu, and about 18% of the sub-surface soil and water was contaminated as a result of the gas production operations, which does not suit it for the handling of foodstuffs.
So for the past few years, earth has been brought in to Toyosu from construction sites around Tokyo in order to replace the top 4.5 meters of contaminated soil with clean soil and raise the land further above the sea level of surrounding Tokyo Bay.

According to the information on the Tokyo Metropolitan Government's website, dating from 2011, the clean-up operation is exhaustive and intricate, involving, for example, not only replacing all the topso...