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.
Furthermore there is also a danger from H2S poisoning.
According to Ms Liekens, the robbers were either very well prepared or very lucky that that they got out alive.
"Digging a tunnel to the sewers can cause subsidence. If for example there are roadworks, safety measures have to be followed. This all has a great impact. I don’t know how the robbers got out alive”.
Police worked through the night investigating the bizarre break-in. It is still unclear how much the robbers got away with. However, several safety deposit boxes were opened.