Hi, (answering in English because your changeset comment was in English ant not Finnish). There in fact IS a connection between Hernesaarenkatu and Telakkakatu.  This is a very tricky, new type of "hidden" crossing that has a right-of-way for pedestrians. In fact, there's a discussion happening right now on the OSM Finnish community on how to tag these crossings: https://community.openstreetmap.org/t/ylijatketun-jalkakaytavan-merkinta/97512