Sian Ka'an - Mar 03, 2007 update

Dive Team: Fred & Chris

Surface support: Sam Meacham

Dive site
Name: Cenote Apocalypse

Conditions: Perfect water conditions. Percolation can be bad in some areas. Noticeable flow.

Dive Objectives:

Check established lines
Explore any potential leads

Summary of results:

Pushed the end of the line upstream. Installing line name “Salt shaker” for 400’.
Off M/L laid line name “Downturn” to dead end at a depth of 17’. Total line 398’.

Possible follow up:

There’s flow at the end of the ML upstream. Another dive will need to be conducted to double check possible leads.

Comments/observation: Line ended in ceiling crack at a depth of 80’. Flow is visible on the halocline above but small passage didn’t allow for further progress. There’s 2 distinct halocline at 66’ and 77’.

Line name:	Saltshaker & Downturn
Passage width (meters):	2
Passage Height (meters):	4
Passage Shape:	Vertical fracture - Dome
Fauna:	Remepedia - Isopod - Shrimp
Speleothems:	Yes
Sediment:	Cream & Orange
Infill:	Breakdown & Swiss cheese
Water:	Halocline near ceiling at 77 ft -
Additional Comments:	Fossils are everywhere – the bottom floor near the entrance is covered with shells.

Equipment and Survey: 3 x EAN 32 stages and 1 x 26amp scooter per diver.

Dive log:
Dive # 1
Time in:	10h30
Time out:	13h40
Total run time:	190 minutes
Max Depth:	82 ft
Av Depth:	65 ft
Divers:	Fred & Chris

Dive Team: Sam & Chris

Surface support: Fred Devos

Dive site
Name: Cenote Dos A’im

Conditions: Perfect water conditions. Percolation can be bad in some areas. Noticeable flow. This is the downstream part of Cenote Apocalypse.

Dive Objectives:

Try to find the downstream of the cave and explore any possible leads.

Summary of results:

The team found 700’ of downstream cave going E/SE. This is mostly small towards the end of the line. Percolation can be bad.

Possible follow up:

The end of the line is open. There’s flow. The passage is small but decorated.
A few SW/W leas need to be checked for exploration.

Comments/observation: The cave is covered with shells. Shallower side if compared to the upstream. There were 2 good size crocs at the surface of the water.

Line name:	Fossils
Passage width (meters):	2
Passage Height (meters):	2
Passage Shape:	Dome - Bedding Plane
Fauna:	Blind fish - Shrimp
Speleothems:	Yes
Sediment:	Brown & cream
Infill:	Breakdown
Water:	Clear but percolation -
Additional Comments:	Fossils everywhere

Equipment and Survey: 2 x EAN 32 stages.

Dive log:
Dive # 2
Time in:	14h00
Time out:	15h30
Total run time:	90 minutes
Max Depth:	37 ft
Av Depth:	32 ft
Divers:	Sam & Chris