§1. In urgent danger of death, the local ordinary can dispense his own subjects residing anywhere and all actually present in his territory both from the form to be observed in the celebration of marriage and from each and every impediment of ecclesiastical law, whether public or occult, except the impediment arising from the sacred order of presbyterate.
§2. In the same circumstances mentioned in §1, but only for cases in which the local ordinary cannot be reached, the pastor, the properly delegated sacred minister, and the priest or deacon who assists at marriage according to the norm of can. 1116, §2 possess the same power of dispensing.
§3. In danger of death a confessor possesses the power of dispensing from occult impediments for the internal forum, whether within or outside the act of sacramental confession.
§4. In the case mentioned in §2, the local ordinary is not considered accessible if he can be reached only through telegraph or telephone.
Source: Code of Canon Law (Vatican.va)