Stuck in your ship? Trapped in your house? Buried in the ground?
Simply press enter, type /unstuck and press enter once more. A list of options /unstuck 0-3 will be displayed along with what each does. Select the best option from 0-3, first try 2 and if that doesn't work go with 0 or 1 depending on whichever is closer.
For example: /unstuck 1