She added that "I have looked at the Belgiëlei and the Nerviërsstraat and there are various sewers in the area ranging from a round tube of 40cm in diameter to an egg-shaped mains that 1.3 metres high and 80 centimetres long. Difficult to stand up in and so they will have had to crawl on their stomach, a perilous task.

Crawling through the sewers is not without danger as they can quickly become full of water i fit rains and there is a danger of drowning.