Disembarking and Emergency Disembarking

If a Transport model is destroyed and it is not
possible to set up a disembarking unit wholly within 3″ of that Transport model and not within Engagement Range of any enemy models, that unit must instead perform an Emergency Disembarkation. This is performed as described for disembarking from a destroyed Transport model, except that a unit that does so must be set up wholly within 6″ of the destroyed Transport model (instead of wholly within 3″) and not within Engagement Range of any enemy models, and when rolling for each disembarking model, that unit suffers 1 mortal wound for each roll of 1-3 (instead of for each roll of 1). If, for any reason, a disembarking model still cannot be set up, that model is destroyed.

– Core Book

When a transport model is destroyed, if it has multiple units embarked within, you can choose to set up the first unit so that the second unit has to do an Emergency Disembarkation. However, when disembarking from a destroyed transport, if there is enough space to set up all models you must do so, you cannot volontarly destroy your own models. If there is not enough space, then you have to set them so the minimum number of models are destroyed.

– WTC Rules