SEATTLE -- The arena for Seattle's NHL expansion franchise remains on track to open sometime in the summer of 2021.

Construction officials said Monday that the entire bowl of the former KeyArena has been demolished and excavation work is ongoing. Officials hope to begin digging down 15 feet from the current floor by year's end and to spend most of 2020 constructing the new seating bowl from the bottom up.

The expansion NHL franchise in Seattle has made its third front-office hire by adding Ricky Olczyk as the club's assistant general manager.

General manager Ron Francis announced the addition Tuesday. Olczyk joins Seattle after spending last season as a pro scout for the Toronto Maple Leafs.