Sian Ka'an - Feb 6, 2007 update

06/02/07

Dive Team: Danny & 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 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:

1. Check out right side of the 3rd T
2. Scout for more cave in the same area

Summary of results:

1. Added 350’ at the end of the 3rd T. Line name: “Nada”. The cave stops in shallow area.
2. Other leads checked to the left of 3rd T. Went to GW’s wooden cloth pin lead and laid another 400’ of line looping back to the same line.
3. Re-surveyed existing GW line from the wooden cloth pin to 3rd T.

Possible follow up:

1. This is an interesting area with large undercut at the halocline. The end of the line needs to be checked out

Comments/observation: Percolation can be bad.

Line name:	Nada & Cloth pin
Passage width (meters):	3
Passage Height (meters):	2
Passage Shape:	Phreatic tube – canyons –
Fauna:	blind fish - shrimp
Speleothems:	Yes
Sediment:	Brown
Infill:	Breakdown
Water:	Slightly tannic – Halocline near ceiling at 42 ft -
Additional Comments:	Fossiles

Equipment and Survey: 3 x EAN 32 stages and 1 x 24amp scooter

Dive log:
Dive # 1
Time in:	10h45
Time out:	14h00
Total run time:	195 minutes
Max Depth:	56 ft
Av Depth:	40 ft
Divers:	Danny & Chris

Dive Team: Franco & Mike

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:

1. Push safeties further on the Arizona line

Summary of results:

1. Safeties successfully brought to plan drop. This was an easy and efficient ride.

Comments/observation: The Cenote before the hydrogen sulphide was extremely tannic with 2mts viz in basin. This is unusual at this time of the year.

Equipment and Survey: 2 x EAN 32 stages and 2 x 24amp scooter per diver.

Dive log:
Dive # 2
Time in:	10h45
Time out:	13h15
Total run time:	150 minutes
Max Depth:	59 ft
Av Depth:	40 ft
Divers:	Franco & Mike

Dive Team: Tom & Sigurd

Surface support: Mike Lindsey

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

Conditions: The water clarity in the Yax Chen basin was 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:

1. Dive the downstream section of YC to drop safeties at 3rd T.

Summary of results:

1. Safeties were dropped at designated spot. This is a challenging cave to scooter through especially with amount of organic silt that is covering the bottom floor

Equipment and Survey: 2 x EAN 32 stage & 1 x 24amp scooter per diver.

Dive log:
Dive # 3
Time in:	13h20
Time out:	15h26
Total run time:	116 minutes
Max Depth:	40 ft
Av Depth:	30 ft
Divers:	Tom & Sigurd