Construction estimators are making a big splash in Rio’s Olympics opening ceremonies, but the construction experts are also having to deal with some unexpected complications, and they’re about to find out how to get the job done.

The new Olympics construction estimators will be used in every bid for a host city to host the 2018 and 2022 Summer Olympics, and the first batch of estimators is expected to be delivered to host cities on September 10, Rio de Janeiro Mayor Eduardo Paes said on Tuesday.

They are not new and are not just an upgrade of existing ones, he said.

The project is being led by the Brazilian construction company Kiewit, which has developed the project in collaboration with the city of Rio.

The city of Sao Paulo is also developing its own estimators, but they are still in the early stages of development, said Paes.

Brazil is hoping to host four Summer Olympics and the 2024 Summer Games in the next 15 years, and Paes has pledged $1 billion in public funds for the Olympic and Paralympic Games.

Kiewit is currently working on the project, and it is expected the first estimators to be available to the city on September 20.

The first batch will be delivered at the Kiewits HQ in Sao Paulo on September 13, the mayor said.

Kewit said that it has received support from the government of Rio de Janiero, which is expected also to contribute.

Paes said the government has given the company permission to set up a second site in the city, in the suburb of Paraiso do Maré.

Kiewis project is not without risks.

In 2014, an earthquake in the state of Minas Gerais killed at least 15 people, and an explosion at a construction site in Brazil’s northeastern state of Bahia in 2015 killed at a rate of about one death a week.