London is often engulfed in fog, which can wreak havoc on flight departures and arrivals at many UK airports. In particular, London's Heathrow Airport has no shortage of inclement weather problems.
But perhaps the following video will give an idea as to why. Shot by YouTube user TopFelya this morning, here's footage of planes landing in the thick fog at Heathrow Airport.
Pilots obviously have assorted instruments to fall back when their sight range is impaired like this, but there's still impressive skill involved in landing a plane in such conditions.
This post originally appeared on our UK site.