It's very disappointing but anticipated that there is an option to use a winged companion to carry you and the other one across the sinkhole but there is a bogus explanation for why you, the MC, can't use your own wing and must expand ressource to do so yourself, because god forbid players having grows wings have a one time advantage and be a little special over their self inserted OCs.
The problem isn't that you need to use camping supplies, money and resources mean nothing in this game, but that they chose to deny the player to do something special with their own charater and to make them inferior to the companion once again. Either no winged humanoid can safely fly in the mine, too narrow and not enougth ceiling height would be a good explaination, or every flying humanoid can.