Previously, the sea floor had been considered an impermeable barrier sealing methane, Shakhova said.

Finian crossed his arms over his chest, an impermeable barrier of confident, careless warrior.

Kazimir's energy signature struck an impermeable barrier that cut clean across spacetime and hyperspace.

The barrier provided by latex condoms provides a nearly impermeable barrier to particles the size of STD pathogens.

Coolant set at -30C will be fed into the pipes, eventually freezing the surrounding earth to create an impermeable barrier.