Scythe: Can I leave resources in the lake?
According to https://www.boardgamegeek.com/article/20771925#20771925


  SUBMERGE: Your character and mechs may move to and from lakes and move from any lake to another (similar to tunnel movement, but with lakes). If a mech moves workers onto a lake or if a character or mech moves resources onto a lake, you may not leave those workers or resources on the lake after moving off of it, nor may a worker move off of the lake without the assistance of the mech.