It is understood that Google publicly released the documents in response to a Freedom of Information request, not in response to the ICO investigation.
Eight of the nine Google engineers whose evidence has been published said they only became aware of the huge data capture in May 2010, when the search engine firm admitted it for the first time.
Google has been under pressure to explain the saga since April this year, when the US Federal Communications Commission (FCC) said that the technology was designed specifically to retrieve information from public Wi-Fi signals as Street View cars photographed peoples’ homes.
The FCC said the collection did not breach US privacy laws, but that other Google engineers – including a senior manager – knew of its data-capture technology. Google has maintained that the data was mistakenly harvested and was never intended to be used.