Before I (Mutabor) had visited Prague for several times. And I suspected the existance of many underground places there. Their signs showed up at almost every step (pic 1–3). Even an underground passage between the two sides of a park, divided by a bank was stylized like an old sever (pic 4).
Inquiry in the Internet had shown that under Prague there are a lot of interesting places. The most prominent was Motol brook, in some respects resembling subterranean river Neglinka in Moscow. And once I had decided to visit Prague together with Lina, who already had accompanied me in Halle and Berlin. At first, walking in the city, we had a look at the outlet, but it was inaccessible without a boat (pic 5). Then we went to the inlet, successfully got in and explored the sewer (pic 6–30).