[RadiationRomeo]

Malevolent aliens were imprisoned beneath the ice ages ago, only to be freed by unsuspecting Earthers.

[ETL]

"Negotiating an underwater tunnel [beneath the ice] to gain the island's interior, those aboard U-33 are amazed to discover a tropical prehistoric world kept warm by volcanic forces.

Here dinosaurs that should be long extinct live and roam, as do a curious race of humanoid savages that appear to exhibit all the various phases of Man's evolutionary development. To survive long enough to repair and replenish the U-boat, wartime enemies must put aside their differences and cooperate with one another. But not everyone is playing from the Kumbaya songbook...

http://www.eccentric-cinema.com/cult_movies/land_time_forgot.htm

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"Negotiating an underwater tunnel [beneath the ice] to gain the island's interior, those aboard U-33 are amazed to discover a tropical prehistoric world kept warm by volcanic forces.

Here dinosaurs that should be long extinct live and roam, as do a curious race of humanoid savages that appear to exhibit all the various phases of Man's evolutionary development. To survive long enough to repair and replenish the U-boat, wartime enemies must put aside their differences and cooperate with one another. But not everyone is playing from the Kumbaya songbook...

http://www.eccentric-cinema.com/cult_movies/land_time_forgot.htm

_____________________________________________

[Rinnwald]

How malevolent could aliens be that can’t free themselves from ice pierced by a drill our spacecraft can carry?