Abstract: A storage tank arrangement, optionally suitable for a vehicle, includes a storage tank for storage of volatile liquids including a tank inner wall and a tank outer wall separated by an insulating inter-wall region, inner and outer feedthrough arrangements, each configured to form a seal with a respective surface of the storage tank arrangement and to permit passage therethrough, and/or permit connection of, of one or more sensors, and a container external of the storage tank outer wall, configured to inhibit egress of the contents of the storage tank in the event of a failure of at least one of the inner and outer feedthrough arrangements. A vehicle including such a storage tank arrangement is also disclosed.