These missions are carried out by Corvettes, Landing Ships, and Carriers (Medium, Medium, and Massive size respectively) in that chronological order. A UFO on a Construction mission will land, stay on the ground for a considerable length of time, and then take off once it has successfully built a base, at which point it will quickly disappear. Once it has taken off, sending an interceptor to the place where it landed will reveal the base. However, you may have instead seen a UFO on a Research mission, as that type of mission can also land and is carried out by similar UFOs. Nonetheless, it is often prudent to check where they were on the ground anyway, just in case it was indeed a Construction mission. UFOs on Research missions that land tends to hang around for a while after they take off, and will sometimes land again.This is a stark contrast from Construction UFOs, which will only ever land once and will quickly escape to space after they take off.Often it is better to attack the construction UFO while it is landed as opposed to allowing it to build a base, considering the drain of monthly funds and speeding up of the ticker that alien bases cause.The exception to this is if you have yet to take down a base in your playthrough as taking one out grants access to several research projects.
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