undrillable
Resists all drills
Undrillable describes material that cannot be penetrated by a drill, either because it's too hard, too tough, or designed to resist drilling.
The term appears in contexts ranging from geology—They hit an undrillable layer of granite—to security hardware like safes with undrillable plates protecting their locks.
Impossible to pass through
- denseClosely packed together
- solidFirm matter state
- unyieldingRefusing to give way
- resistantWithstanding external forces
tough · adamantine · obdurate · rocklike · indurated · compacted · cemented · flinty
Drilled underground passage
- wellboreDrilled subsurface hole
- penetrationEntry into something
- core sampleCylindrical subsurface extraction
- explorationTraveling through unknown regions
petroleum · offshore · subsea · oilfield · completion · reservoir · upstream · wildcatting
Solid stone underground
- graniteIgneous rock, quartz-rich
- basaltFine-grained volcanic stone
- quartziteMetamorphic silica-rich stone
- chertFine-grained siliceous stone
diamond · hardpan · formation · strata · igneous · metamorphic · crystalline · impermeable
Hard compound for cutting
- hardened steelHeat-treated ferrous alloy
- titaniumElement twenty-two
- ceramicFired clay material
- reinforced concreteCement with steel bars
armor plate · bulletproof · case-hardened · tempered · anodized · composite · laminated · industrial diamond
impenetrable
Impossible to pass through
- denseClosely packed together
- solidFirm matter state
- unyieldingRefusing to give way
resistant · tough · adamantine · obdurate · rocklike · indurated · compacted · cemented · flinty · steely
borehole
Drilled underground passage
- wellboreDrilled subsurface hole
- penetrationEntry into something
- core sampleCylindrical subsurface extraction
exploration · petroleum · offshore · subsea · oilfield · completion · reservoir · upstream · wildcatting · derrick
bedrock
Solid stone underground
- graniteIgneous rock, quartz-rich
- basaltFine-grained volcanic stone
- quartziteMetamorphic silica-rich stone
chert · diamond · hardpan · formation · strata · igneous · metamorphic · crystalline · impermeable · subsurface
tungsten carbide
Hard compound for cutting
- hardened steelHeat-treated ferrous alloy
- titaniumElement twenty-two
- ceramicFired clay material
reinforced concrete · armor plate · bulletproof · case-hardened · tempered · anodized · composite · laminated · industrial diamond · corundum