Sian Ka'an - Feb 8, 2007 update

Dive Team: Mike & Sigurd

Surface support: Fred Devos

Dive site
Name: Yax Chen
Coordinate: WGS84 UTM 451245 2226084

Conditions: The water clarity in the Yax Chen basin was exceptionally clear. The water condition in the downstream part of the cave was fair. Flow was noticeable. The downstream is heading NE/E in parallel with the coast line. There’s a fair amount of organic particles in suspension throughout the water column.

Dive Objectives:

Set-up dive. Drop 4 stages for exploration team at SM# Chupa 3

Summary of results:

Set-up dive went well.

Comments/Observations:

The silty area leading to Cenote Rojo needs to be navigated with great care especially when carrying multiple stages.

Equipment and Survey: 3 x EAN 32 stages and 1 x 33amp scooter per diver

Dive log:
Dive # 1
Time in:	10h00
Time out:	11h13
Total run time:	73 minutes
Max Depth:	45 ft
Av Depth:	38 ft
Divers:	Mike & Sigurd

Dive Team: Alex, Franco & Tom

Surface support: Fred Devos

Dive site
Name: Yax Chen
Coordinate: WGS84 UTM 451245 2226084

Conditions: The water clarity in the Yax Chen basin was exceptionally clear. The water condition in the downstream part of the cave was fair. Flow was noticeable. The downstream is heading NE/E in parallel with the coast line. There’s a fair amount of organic particles in suspension throughout the water column.

Dive Objectives:

Set-up dive for the Arizona team. Drop 4 stages and 2 x 33amp scooters 40 minutes.

Summary of results:

The set-up dive went well.

Equipment and Survey: 2 x EAN 32 stages and 2 x 33amp scooter per diver.

Dive log:
Dive # 2
Time in:	10h15
Time out:	11h40
Total run time:	85 minutes
Max Depth:	40 ft
Av Depth:	30 ft
Divers:	Alex, Franco & Tom

Dive Team: Danny & Fred

Surface support: Tom Karch

Dive site
Name: Yax Chen
Coordinate: WGS84 UTM 451245 2226084

Conditions: The water clarity in the Yax Chen basin was exceptionally clear. The water condition in the downstream part of the cave was fair. Flow was noticeable. The downstream is heading NE/E in parallel with the coast line. There’s a fair amount of organic particles in suspension throughout the water column.

Dive Objectives:

Check lines further downstream and continue exploration toward OBH.

Summary of results:

Laid 382ft of line in a passage running back to ML.

Possible follow up:

There is obviously more cave to explore in this side of the cave. Entering Cenote Perla on the OBH side would increase the chance of a possible connection.

Comments/observation: Cenote “Rojo” had only a light touch of tannic water at the surface. The cave changes substantially as soon as it runs NW again.

Line name:	Clothesline
Passage width (meters):	3
Passage Height (meters):	10
Passage Shape:	Vertical fracture - Bedding plane – Canyons
Fauna:	Blind fish - Shrimp
Speleothems:	Yes
Sediment:	Cream - Clay
Infill:	Breakdown
Water:	Halocline near floor passage at 40 ft -
Additional Comments:	Large cave

Equipment and Survey: 4 x EAN 32 stages and 1 x 33amp scooter per diver

Dive log:
Dive # 3
Time in:	12h30
Time out:	15h55
Total run time:	205 minutes
Max Depth:	40 ft
Av Depth:	35 ft
Divers:	Danny & Fred

Dive Team: Per & Chris

Surface support: Mike Lindsey

Dive site
Name: Yax Chen
Coordinate: WGS84 UTM 451245 2226084

Conditions: The water clarity in the Yax Chen basin was exceptionally clear. The water condition in the downstream part of the cave was fair. Flow was noticeable. The downstream is heading NE/E in parallel with the coast line. There’s a fair amount of organic particles in suspension throughout the water column.

Dive Objectives:

Try to find more cave leading towards the SKBR.

Summary of results:

Checked SM #133 & #135… no go
The team went back to the end of a line laid by David & Chris (line name: Fudge) and added 700ft of line.

Possible follow up:

There are several more leads to check in this area.

Comments/observation: The area is complex and it will take time to check through fully the many leads. Base camp from Cenote Gemini in the near future will help in reducing the complex logistics. Visibility can be challenging sometimes.

Line name:	Cream
Passage width (meters):	2
Passage Height (meters):	3
Passage Shape:	Dome - Bedding plane
Fauna:	Remepedia - Shrimp
Speleothems:	Yes
Sediment:	Red - Clay
Infill:	Breakdown
Water:	Tannic in dome - Halocline near ceiling at 54 ft -
Additional Comments:	Fossils

Equipment and Survey: 5 x EAN 32 stages and 3 x 33amp scooter per diver

Dive log:
Dive # 4
Time in:	12h00
Time out:	17h00
Total run time:	300 minutes
Max Depth:	80 ft
Av Depth:	55 ft
Divers:	Per & Chris

Dive Team: Alex, Franco & Tom

Surface support: Sigurd Bowitz

Dive site
Name: Yax Chen
Coordinate: WGS84 UTM 451245 2226084

Conditions: The water clarity in the Yax Chen basin was exceptionally clear. The water condition in the downstream part of the cave was fair. Flow was noticeable. The downstream is heading NE/E in parallel with the coast line. There’s a fair amount of organic particles in suspension throughout the water column.

Dive Objectives:

Clean up dive for Arizona exploration team

Summary of results:

Clean up dive went ok. Cleaned up 6 stages and 2 33amp scooters

Equipment and Survey: 1 x EAN 32 stage and 2 x 33amp scooter per diver

Dive log:
Dive # 5
Time in:	15h30
Time out:	16h50
Total run time:	80 minutes
Max Depth:	40 ft
Av Depth:	30 ft
Divers:	Alex, Franco & Tom