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from the sixth air space to avoidthe silt we had riled up along theshallow route going in. We discoveredanother isopod on the way out,and spent much of decompression inthe spring basin examining the remainsof a former railroad bridgethat according to Sr. Santos was dynamitedduring the revolution. Ialso discovered to my surprise thatI could not hear the waterfall whileunderwater above the falls, eventhough it is very audible above thesurface. We had previously supposedthat we would be forewarned as to theexistence of waterfalls beyond downstreamsumps from the noise underwater,but now it appears that this maynot be true. Sump divers beware!On dive #32 Jamie, Carol andFrank extended the deep line another45 meters to a depth of 43 meters anda penetration of 254 meters. Mostof the participants feel that theChoy definitely warrants further investigationand may soon come up intosignificant air-filled passage.Nacimiento del Rio FrioWe checked the headsprings andsnorkeled the lower spring, butnever found any cave here despitethe considerable volume of water inthe river.Mapping techniquesandExpedition notesNaturally, underwater surveyingdoes not produce the degree of accuracycommon to most AMCS maps.Nevertheless, the compass and "knottedline" method we employ is probablymore accurate than most caverswould suppose. One reason for thisis that significant errors in linearmeasurement can be detected easily.Each length of the line is measuredagainst a surveying tape and knotted'at precise 10 foot intervals, andthe resulting total supply of lineis of a known length. Thus, if a600 foot length of line was laid inthe cave, the survey shots should30total 600 feet if no errors are made.A compact Suunto diver's compassgraduated in increments of 5 degreesat intervals wide enough to estimatethe nearest 2-1/2 degrees is used fordirection. Ascertaining the depth ofeach station so we can convert ourdistances to "true horizontal" is imeasy, clinometer-less task, thanks toour depth guages. Getting accuratesurvey shots between stations in poorwater visibility is no problem becausewe can line up the edge of thecompass against the guideline to obtainthe proper azimuth.
We discovered a source of compressedair at Infra on 704 AvenidaEjercito Nacional in Tampico, buttwo of the five sets of twin tankswe had filled there smelled likeeau de Greyhound bus and gave Paula bad headache on a dive at theChoy. It should also be added thatcave diving to depths in excess of40 meters, as described in this report,is a very complicated activityrequiring years of experienceand highly specialized procedures.It is only because the AMCS ActivitiesNewsletter is not casuallyavailable to sport diving enthusiastsand the fact that the informationis of speleological valuethat we have included the depths ofthe deepest dives in this report.The Central Sea. (Riou, from Journey to the Center of the Earth)31
Page 3 and 4: Number 10AMesActivitiesNewsletterJu
Page 6 and 7: compilcJ Ly Peter S. SprouseAUSTRIA
Page 8 and 9: Long Caves of MexicoPeter S. Sprous
Page 10 and 11: ,/
Page 12 and 13: hole with a 3 meter cave entrance.I
Page 14 and 15: Interestingly enough, the majorpass
Page 16 and 17: proceeded to find 78 ticks on mybod
Page 19 and 20: The Sierra de Guatemala mountain ra
Page 21 and 22: meter long, 9 meter deep, slopingdr
Page 25 and 26: Diving the big springs of the Sierr
Page 27 and 28: Aerial view of Nacimiento del R10 M
Page 29 and 30: Nacimiento del Rio CoyOn Monday, 26
Page 31: Entrance chamber, Nacimiento del Rl
Page 36 and 37: Steve Zeman rappels into the SalaGr
Page 38 and 39: no problem and we were soon fourwhe
Page 40 and 41: event that the dive panned out andw
Page 42 and 43: keep an accurate fix on whether itw
Page 44 and 45: we had finished the last of the rop
Page 46 and 47: tance. This continued for some 280m
Page 48 and 49: Talus summit at the beginning of An
Page 50 and 51: source, a kilometer and a half upst
Page 52 and 53: consisted of a dusty dry corridorbo
Page 54 and 55: There was much speculation aboutthe
Page 56 and 57: turning to Camp II we found Richard
Page 58 and 59: We had barely slept three hourswhen
Page 60 and 61: POSTEXPEDITION NOTESBill Steele and
Page 63: -f//'~:;San,Agustin,,~~~:= ']--="~-
Page 67: translated from the Mazatecby Cathy
Page 70 and 71: Ateschalla Norte ySurThe following
Page 73: CUEVA DE TASALOLPANcuetzalan, puebl
Page 76 and 77: CuetzalanSteve KnutsonSpring 1979Ma
Page 78: Thirty meter pitch into canal secti
Page 81: ENTRADACANONACUEVATECOLOESTADA DE P
Page 85 and 86:
S6tano del BuqueRobert JefferysSota
Page 87 and 88:
the rope. What John had been trying
Page 89:
METERSo50NmICEBERG ROOM100-506500
Page 92 and 93:
CUEVA DE XOCOTLATintroduction by Ge
Page 94:
was a sizable horizontal sectionwhi
Page 97:
Cueva de XocotlatMunicipio de San P
Page 101 and 102:
1979 SPRINGDale PatePROJECTPlans we
Page 103 and 104:
were the only ones left at the fiel
Page 105 and 106:
to 4 hours exploring and sketchingv
Page 107 and 108:
persons working on this mapping tea
Page 109 and 110:
Fifteen meter drop in Moria.(Thomas
Page 111 and 112:
French delegationarrivesAfter sever
Page 113 and 114:
French ConnectionFriday the 13th sa
Page 115 and 116:
everyone prepared for the hike toCa
Page 117 and 118:
Terri t Dale t and Steve returned t
Page 119:
SISTEMAPURIFICACIONMunicipio Villa
Page 122 and 123:
Letters to the EditorTothe Editor:B
Page 124:
ATLAS DES GRANDES GOUFFRES DU MONDE
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