Priority: 1
Position: 32°43.3928´S, 57°15.9606´E
Water Depth: 700 m
Sediment Thickness: 0 m
Maximum Penetration: 200 m pending approval

Objectives: The objectives of Site HDS-1 are to:

1. Characterize operating parameters, i.e., flow rates, pump pressures, weight on bit of the hammer drill, as seen from the drill floor.
2. Characterize hammer-drill spudding capability on flat outcrops.
3. Test entire hammer-drill system by drilling in 20-40 m of 13-3/8 in. casing in a fractured hard-rock environment with little or no overlying sediment or talus and with little or no slope.

Drilling Program: Deploy the hammer drill only. Drill several shallow (1-3 m) test boreholes while characterizing the flow rates, pump pressures, and drill bit revolutions per minute required to spud and advance the borehole efficiently. Drill several shallow (1-3 m) test boreholes on flat outcrops. Deploy entire hammer-drill system and perform the first full scale drill-in test.

Logging and Downhole Operations: None

Nature of Rock Anticipated: Gabbro

Priority: 1
Position: 32°36´S, 57°15´E
Water Depth: 2400 m
Sediment Thickness: 0 m
Maximum Penetration: 200 m pending approval

Objectives: The objective of Site HDS-2 is to:

1. Test hammer drill system by drilling in 40-60 m of 13-3/8 in. casing in a sloped fractured hard-rock environment with little or no overlying sediment or talus.

Drilling Program: Deploy entire hammer drill system and perform second full scale drill-in test.

Logging and Downhole Operations: None

Nature of Rock Anticipated: Gabbro

Priority: 1
Position: 32°43´S, 57°11´E
Water Depth: 2800 m
Sediment Thickness: 0 m
Maximum Penetration: 200 m pending approval

Objectives: The objective of Site HDS-3 is to:

1. Test hammer-drill system by drilling in 60-80 m of 13-3/8 in. casing in fractured hard-rock with overlying talus.

Drilling Program: Deploy entire hammer-drill system and perform third full scale drill-in test.

Logging and Downhole Operations: None

Nature of Rock Anticipated: Gabbro

Priority: 1
Position: 17°01.458´S, 88°10.899´E
Water Depth: m
Sediment Thickness: 370 m
Maximum Penetration: 570 m pending approval

Objectives: The objectives of Site 757 are to:

1. Drill a borehole into basement on the Ninetyeast Ridge in the Indian Ocean to provide a site for the installation of a broadband ocean seismometer and instrument package for the ION program.
2. Core 200 m into basement.

Drilling Program: Jet-in first casing string. Drill hole and case to basement. RCB core in basement.

Logging and Downhole Operations: Triple combo and FMS-sonic.

Nature of Rock Anticipated: Basalt

Priority: 2
Position: 27°21.00´S, 87°35.00´E
Water Depth: 1520 m
Sediment Thickness: 139 m
Maximum Penetration: 339 m

Objectives: The objectives of Site 756 are to:

1. Drill a borehole into basement on the Ninetyeast Ridge in the Indian Ocean to provide a site for the installation of a broadband ocean seismometer and instrument package for the ION program.
2. Core 200 m into basement.

Drilling Program: Jet-in first casing string. Drill hole and case to basement. RCB core in basement.

Logging and Downhole Operations: Triple combo and FMS-sonic.

Nature of Rock Anticipated: Basalt

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