Geid Ref. 66864408

Depth:155.1m Length: 816.5m

Note: the total depth of the cave from the highest point to the lowest point is 155.1m but for accuracy on calculating depth relevent in The Efflux the depth was calculated from the tag which was linked to the serface suevey. Depth from the tag, as shown on the Al map, is 148.3m.

Grill Cave is located at the end of the track leading east from the Louis Gaymee carpark. A low duck through the entrance leads to the entrance chamber. Immediately on the left, behind the boulders is a hole in the floor 0.5m in diameter. This leads to the chamber at the bottom of the first big ladder. On the eastern side of the entrance chamber over the sediment bank is a small passage on the right sloping up at 35°-50° which becomes impassable after 8m.

On the northern side of the entrance chamber is a short ladder leading into a pit. Facing down the cave, the passage to the left of the ladder provides an altemative route to the end of the chamber containing the first big ladder. The way on is to the right, through the low arch and down the first big ladder to a walk through chamber. At the end of this chamber is an east-west trending rift. Up to the right is the

loop to the short ladder in the entrance chamber. To the left is a climb up which leads to a ledge half way up the Daylight Hole. Straight ahead in the floor canyon is a low duck leading to Skylight Chamber. Up to the left is the Daylight Hole, B118. Over to the right are two side passages two metres apart, joined by 21m of low passage. The way on is over the boulders to the southwestern end of the chamber. On the left is a hole in the roof which leads to 15m of tight, sharp passage, moist with seepage water from the surface.

At the end of the chamber is a 3.5m ladder leading to the top of the 10m waterfall, accessed from beneath the boulder on the right. To the left is a ledge with a safety rail leading to the top of two ladders, 3.5m and 6m long. At the bottom of the ladders, the low passage under the waterfall gives access to 50m of passage leading back under Skylight Chamber. This section of the core is unstable and great care should be taken.

The large chamber at the bottom of the 6m ladder is best traversed on the left hand side where a double ladder is encountered. At the bottom of the first section of ladder is a passage on the left (if facing ladder). This provides an easier route to the top of the Mud Slide bypassing the Horizontal Ladder. This section contains on old high level tourist section where a ladder is still in place. The passage continues through on area containing large mud-coated formation into low passage with a sloping rock floor. This leads over holes in the floor to where the passage turns to the left to a 2.7m ladder which leads to the lop of the Mud Slide.

Alternatively, on the double ladder, continue down the second section of ladder to the chamber floor. 9m across the chamber, the Horizontal Ladder is reached. From this point there are several ways of reaching the Mudslide as the large collapsed blocks provide a maze of passages. At the top of the Mudslide, to the west is a dyke controlled passage which leads back to the upper level. In the northwestern end of the chamber is a floor canyon which indicates the way on. The floor canyon, flanked with speleothems, continues for 15m to a hole in the floor. Descending this hole is a difficult climb and it is easier to step over and continue, Up to the right is Crystal Palace, which contains vandatised speleothems. Continuing straight ahead, the passage becomes progressively lower until a floor canyon is reached. Before the end, skirting around to the right avoids the 3m drop and leads to the top of the last ladder.

The ladder leads into Safe from the Russians Chamber. The Chamber was originally named from the carbide inscription on the wall, although this is now faint. The passage here is 3.5m high and 5m wide, after 18m the Rock Slide Chamber is reached. The chamber is marked with a reflective yellow sign - caution loose boulders. Up and to the right is a 3m high aven but the cave continues straight ahead down through the boulders. The squeeze through the boulders emerges at the top of a wide, sloping bedding plane passage with a deep floor canyon. Follow the Slippery Dips, a series of mini-water channels, to the bottom of the slope where the cave flattens our for 8m. A 1.8m climb followed by 28m of passage with a sloping rubble floor leads to the Boulder Holder. The well defined passage through the boulders leads to a floor canyon. Initially the floor canyon is shallow but deepens to 3.5m via a series of climbs. The floor canyon emerges into a chamber with a sand and rubble floor. Here the cave bifurcates.

The Left Hand Branch continues across the chamber to a low crawl 0.7m wide and 0.7 high hula lump in the floor reduces the height to 0.5m The passage opens out to a width of 8w but reduces down again to 0.7m at a 2.4m climb. At the bottom of the climb the passage broadens to 2.2m. After 3m a strike-orientated rift is encountered. A short ladder is required for the 3.3m drop to the passage below, To the west the passage pinches our after 11m. To the east the low passagecanrinoes overa series of steps to a hanging lake of still water.

The Right Hand Branch begins as low passage 0.5m high and 1m wide, widening to 1m high and 2m wide. The passage continues for 22m to where a dyke has intruded. The passage continues along the dyke for another 9m to a 3.6m drop. The drop leads to a pit 2.5m in diameter. Opposite, a stream enters from a high level. The way on is beneath where you entered. The passage, 1.2m high and 0.7m wide, widening to 1.8m continues to follow the dyke for 42m to the top of a pitch. The pitch, requiring a ladder, descends at ~50’ for 24w to the terminal sump. The sump, ~8m long and 2m wide is fed by an active stream flowing from the left.