Logbook Scuba Dive # 370 - USS Arkansas (BB-33)

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Date:	Entry Time:	Dive Time:	Max. Depth:
Sat, 27-Oct-2012	08:36:00	71 minutes	52.5 metres
Dive Location:		City / Island:
USS Arkansas (BB-33)		Bikini Atoll
Country:		Dive Master:
Marshall Islands		Brian Kirk
Dive Charter:		Dive Trip:
Indies Trader Marine Adventures		Bikini Atoll - Oct 2012
Buddy/Buddies:
Fiona Edwards, Peter Fear, Stephen Crosling
Dive Details:
Entry:	Boat Name:
Boat	MV Windward
Start PG:	Entry Time:	Exit Time:	End PG:
-	08:36:00	09:47:00	-
Altitude:	Rep. Dive:	Surface Interval:
0 m	No	16:19
Max. Depth:			Avg. Depth:
52.5 metres			20.68 m
	Dive Time:		Deco. Dive:
	71 minutes		Yes
Conditions:
Weather:	Air Temp.:	Water Temp.:
Sunny	31 °C	30 °C
Water:	Waves:	Current:
Salt	No Waves	No Current
Visibility:	Horizontal Vis.:	Vertical Vis.:
Good	30	30
Equipment:
Weight:	Dive Suit:	Dive Computer:
0 kg	Wetsuit 3 mm Steamer	Suunto HelO2
Equipment used on this dive:
Apeks XTX200 Regulator - Stage 1 \| Apeks XTX200 Regulator - Stage 2 - Nitrox \| Apeks XTX200 Regulator - Twin Primary \| Apeks XTX200 Regulator - Twin Secondary \| Apollo ATB Multi Purpose Boots \| Apollo Bio-Fin Pro \| Aropec Mesh Dive Gear Duffle Bag \| Backscatter Custom GoPro Underwater Housing \| Dive Gear Express Stainless Steel Finger Spool \| GoPro HD Hero2 outdoor edition \| Green Force 1.5 metre Umbilical \| Green Force Flexi IV Battery Pack \| Green Force Flexi IV Tank Connector \| Green Force Goodman Handle - HID 150F \| Green Force HID 150F Lighthead \| Halcyon Titanium Knife Sheath - Tech \| INNOBEAM UR5 LED Dive Light \| Kent Tooling Ratchet Reel - 75 metres \| Miflex Thin-Line Oxygen SPG - Stage 2 \| Miflex Thin-Line SPG - Stage 1 \| Mirage A250 Wrist Slate \| Northern Diver KN14 Titanium Dive Knife - Tech \| OMS Aluminium Backplate - Tech \| OMS Comfort Harness II \| OMS Compact Titanium Line Cutter with Pouch \| OMS Dual Bladder, Banded Wing - Tech \| OMS Silicone Necklace Secondary - Tech \| OMS Submersible Pressure Gauge \| Patriot3 Maritime Ops-Core Base Jump Sport Helmet \| Sonar Explorer Black Silicone Mask - Backup \| Sonar Explorer Black Silicone Mask - Primary \| Sonar Steamer 3mm \| Suunto HelO2 Dive Computer \| Suunto Transmitter - Tech \| Suunto Vytec DS Dive Computer \| Waterborne Safety Strap - HelO2 \| Waterborne Safety Strap - Vytec

Cylinder Set #1
Cylinder Type:	Cylinder Size:	Working Pressure:	Supply Type:
Steel	24 litres	300 bar	Open Circuit (OC)
O2:	He:	Min. PPO2:	Max. PPO2:
21%	0%	-	1.4 bar
EAN 21	MOD:	EAD:	END:
EAN 21	56.6 m	56.6 m	56.6 m
Start Pressure:	End Pressure:	Diff. Pressure:
253 bar	109 bar	144 bar
Avg. Depth:	SAC Rate:
-	-

Cylinder Set #2
Cylinder Type:	Cylinder Size:	Working Pressure:	Supply Type:
Alumimium	11 litres	200 bar	Open Circuit (OC)
O2:	He:	Min. PPO2:	Max. PPO2:
50%	0%	-	1.6 bar
EAN 50	MOD:	EAD:	END:
EAN 50	22.0 m	10.3 m	22.0 m
Start Pressure:	End Pressure:	Diff. Pressure:
200 bar	-	-
Avg. Depth:	SAC Rate:
-	-

Cylinder Set #3
Cylinder Type:	Cylinder Size:	Working Pressure:	Supply Type:
Steel	7 litres	232 bar	Open Circuit (OC)
O2:	He:	Min. PPO2:	Max. PPO2:
95%	0%	-	1.6 bar
EAN 95	MOD:	EAD:	END:
EAN 95	6.8 m	-8.9 m	6.8 m
Start Pressure:	End Pressure:	Diff. Pressure:
200 bar	-	-
Avg. Depth:	SAC Rate:
-	-

Avg. Depth:	SAC Rate:
20.68 m	15.86 litres/min
Gas Mixture:
-

For our Saturday morning dive, we headed over to the USS Arkansas (BB-33) battleship. Noted for the size of its main battery of twelve 12-inch guns in six twin gun turrets and 12-inch thick armour, this US battleship lies bottom side up and listing to starboard in 54 metres of water. The riveted steel vessel is 171 metres long and weighs 23,066 standard tons. USS Arkansas served in World War I, and during World War II, she escorted convoys in the Atlantic and bombarded shore targets during the invasions of Normandy in Europe, and Iwo Jima and Okinawa in the Pacific. She survived the "Test Able" air atomic blast on 1 July 1946, but was sunk by the "Test Baker" underwater atomic blast on 25 July 1946. The first thing you notice as you drop down to the bottom of the USS Arkansas's hull (at the top!) is the terrible damage inflicted on her by the "Test Baker" blast. Her hull is crushed like a concertina, huge waves of buckled hull plates folded in on the more rigid structure of the girders within. There is a huge gash where the nuclear blast pierced three layers of 12-inch armour. All testaments to the mind-boggling forces unleashed by the atomic bombs!


USS Arkansas underway on 11 April 1944 USS Arkansas anchored in San Pedro harbour on 1 January 1945

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