Upper Flood Swallet

{{Short description|Limestone cave in Somerset, England}}

{{Use dmy dates|date=April 2022}}

{{Infobox Cave

| name = Upper Flood Swallet

| photo = File:Neverland. Upper Flood Swallet , Charterhouse (geograph 4144542).jpg

| photo_caption =

| map = Somerset

| location = Charterhouse, Somerset, UK

| coordinates = {{coord|51.29885|N|2.71037|W|format=dms|}}

| grid_ref_UK = ST 50570 55765

| depth = 110m

| length = 4.1km

| survey = [http://mendipcavinggroup.org.uk/sections/upperflood/uf_500.htm MCG Upper Flood Survey 2012]

| discovery = 3 October 1968[http://www.mendipcavinggroup.org.uk/ufs.html Mendip Caving Group]

| geology = Limestone

| entrance_count = 1

| difficulty = Extensive system with tight strenuous sections

| hazards =

| access = Leader controlled by Mendip Caving Group; experienced cavers only

| registry = Mendip Cave Registry{{cite mcra |id=260 |name=Upper Flood Swallet |accessdate= 2016-08-29}}

}}

Upper Flood Swallet which was originally known as Blackmoor Flood Swallet, is an exceptionally well-decorated cave near Charterhouse, in the carboniferous limestone of the Mendip Hills, in Somerset, England. The cave is part of the Cheddar Complex SSSI.

The entrance was revealed in the Great Flood of 1968,{{cite web|title=Upper Flood Entrance Swallet|url=http://www.mendipcavinggroup.org.uk/sections/upperflood/occpub4.html#2b|publisher=Mendip Caving Group|access-date=24 February 2011}} giving the cave its name.{{cite book|last=Witcombe|first=Richard|title=Who was Aveline anyway?: Mendip's Cave Names Explained|year=2009|publisher=Wessex Cave Club|location=Priddy|edition=2nd|page=189|isbn=978-0-9500433-6-4}} It was dug consistently since then with breakthroughs occurring in 1971, 1972, 1985 and 2006.

As of September 2008 it is over 3.5 km in length and around 125 m deep.{{cite web | title=Mendip | work=UK and Ireland Cave Lengths and Depths |url=http://www.ukcaves.co.uk/tables.php?region=2&length_depth=length | access-date=2007-02-18}}