United States » Diepolder II

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Rated 2.8/5 stars (399 ratings)

Overview Location & Specifics Conditions Resources Nearby Systems  
Diepolder II and Diepolder III are located on the Sand Hill Ranch Scout Reservation, Hernando Co. Florida. The property was donated to the Boy Scouts after the Diepolder family passed away in the mid to late 70's. The Florida Speleological Researcher's (FSR) was developed after the boy scouts took control, and this program is the oldest working guide program in existence today. Guidelines were developed by FSR to insure that all diving operations are carried out with the utmost regard for the safety of the members, respect for the caves and property, and sincere courtesy to the landowner.

The submerged caves of the Diepolder systems are among the most unique discovered within the Western Hemisphere. Diepolder II is the deepest cave in the continental US.

The Directors of FSR have been chosen from the most active, experienced deep cave divers within the state of Florida. It is the intent of the BOD of FSR to provide and maintain access for all qualified members through this program.

Some of the Regulations for Diving:
  • All divers must be full cave trained through either the National Association for Cave Diving (NACD) or the National Speleological Society-Cave Diving Section (NSS-CDS). There are no exceptions.
  • All divers must show proof of 100 cave dives, through logbook entry, or the Abe Davis or Wakulla Award.
  • Trimix gas dives shall require the appropriate trimix certification.
  • All divers must be members in good standing of FSR, Inc. There will be no exceptions.
  • Ratio for diving Sink #3: Any single guide may accompany no more than three guests within Sink #3 at any time. To secure this ratio, at least one guest must have a minimum of five visits into Sink #3 prior.
  • To dive Sink #2 - You must have a minimum of 3 dives in Sink #3 before proceeding to Sink #2.
  • Ratio for diving #2: Any single guide may accompany no more than two guests within sink #2 at any time. To secure this ratio, at least one guest must have a minimum of at least five dives within Sink #2 prior.
History: Will Walters discovered the Diepolder system by air. D III is a max depth of apprx. 300' D II is a max depth of apprx. 365'. In 1979 Dale Sweet of Winter Haven did a dive to a max depth of 360' in the II sink. This was the first time a diver had explored a Florida cave while breathing mixed gas. Dale had placed a small American flag with a secret message on the back for all those who would follow. Sheck Exley made the same dive using compressed air a year later. Then in 1987 Bill Gavin and Lamar English did the same dive using mixed gas (which was just now starting to come into mainstream). Through the 80's little was known about the cave system beyond the pit and there were no maps. March 23rd of 1991, a group of divers organized a Project to gather more information about the system beyond the Flagroom. Some of the early guides included names such as Sheck Exley, Dale Sweet, Bill Main, Steve Stratsma, Bill Gavin, Vaugn Maxwell, just to name a few.

Click here for a current list of Diepolder guides (4.5.2007)
Click the map below for all mapping options.
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Latitude: 28.517755
Longitude: -82.52912
Coordinate System:
Maximum Depth: 360'
 Cave Diving
 Cavern Diving
 Open Water Diving
Date Submitter Visbility Remarks
12/23/2010 phil 100 Spectacular dive site. It was a fabulous dive. Our guide, Dan Paterson said the upstream viz was verry good (beter than usual). Thanks again Dan for this beautiful dive.
4/23/2009 Bob Cree 100 Basin water levels are way down. Crack vis was fine. Like Jim said - hard to judge vis in the upstream. It was not near as good as I have seen it. Could easily see the floor from above the line and way out in front - so 150ish. But appeared pretty hazy. Downstream was near Cobalt Blue! Best vis of my 2 week trip.
12/10/2007 Jeff Addis 80 ft correction UPSTREAM VIS ABOUT 80 ft downstream unknown
12/10/2007 Jeff Addis 80 ft basin nice and clear. crack fairly clear minus cascading silt on entry. downstream vis about 80 ft. very cool dive
7/12/2007 Rich Variable Both upstream and downstream are very clear, but the crack is EXTREMELY silty (zero vis) due to the low water levels.
6/5/2007 Rich Variable Water level is very low, downstream was hazy but upstream was crackling blue which made for a gorgeous dive!
8/4/2005 Jim Wyatt 100' Dived Diepolder 2 on 1 & 4 August with Bill Main. Vis in the crack was less than 5 feet. Once at the bottom of the crack at 190 feet it cleared up nicely. Vis on the downstream side was 100 feet - 150 feet. It is very difficult to judge in that HUGE HUGE system. 1 August we dived upstream and the vis was not as good as the downstream side on Aug 4. But, it was around 80-100 feet of vis.
Click here if you would like to contribute any information or resources for this system.
Description Type Date Author Remarks
 Guide List PDF
 Profile #2 Map
 System Map Map
Sslect Search Radius:
System Depth Cave Cavern OW Last Report Distance (mi)
 Overview Information Available for Buford Spring  Buford Spring 167 True True False 3/14/2024 8.8
 Overview Information Available for Eagles Nest  Eagle's Nest 315 True False False 3/14/2024 5.5
   Lost 40 165 True False False 7/15/2023 1.4
 Overview Information Available for Hospital Hole  Hospital Hole 143 False True True 4/30/2023 5.8
   Warm Springs 140 False True False 11/1/2022 9.1
 Overview Information Available for Wards Sink  Ward's Sink 198 True True True 9/30/2022 8.8
   Arch Sink 197 True True False 7/18/2021 7.1
   Bulldozer Sink 60 False True True 3/22/2020 5.9
 Overview Information Available for Diepolder III  Diepolder III 300 True False False 5/27/2017 0.3
   Little Gator Siphon 180 True False False 1/3/2015 8.9
 Overview Information Available for Twin Dees  Twin Dees 335 True False False 8/3/2013 3.2
   Isabella Spring 110 True False False 5/22/2013 12.1
 Overview Information Available for Weeki Wachee Spring  Weeki Wachee Spring 407 True False True 4/28/2012 2.7
   Gator Spring 192 True False False 12/6/2009 5.5
 Overview Information Available for Blind Spring  Blind Spring 180 True True False 11/29/2009 11.6
   Free Ride Cave 120 True False False 10/10/2009 12.6
   Double Keyhole 230 True False False 1/11/2009 11.4
 Overview Information Available for Horseshoe Spring  Horseshoe Spring True True False 1/10/2009 12.7
 Overview Information Available for Little Salt Spring  Little Salt Spring 240 True False False 9/23/2008 5.8
 Overview Information Available for Bobhill Springs  Bobhill Springs False False False 12/29/2007 8.9
   The Jewel 315 True True False 6/2/2006 11.5
 Overview Information Available for Mud Spring  Mud Spring 210 True True False 11/20/2005 6.2
   Nursery Sink 214 True False False 1.2
   Willow Sink True False False 2.4
 Overview Information Available for Marys Sink  Mary's Sink 58 True False True 1.3
   Garden World Sink 250 True False False 10.7
   Coffee Sink False False False 9.3
 Overview Information Available for Joes Sink  Joe's Sink 60 True False True 1.3
   Snook Spring 120 True False False 12.5
   Star Sun Spring 120 True False False 12.6
   Snake Eyes False False False 5.4
   Wolf Sink False False False 1.9
 Overview Information Available for Hospital Spring  Hospital Spring 40 False True False 5.9
 Overview Information Available for Jenkins Creek  Jenkins Creek 50 True False False 6.4