Yes, that is why I insisted on caution entering the caves.

4 seconds sound clip from the Attack of the Crab Monsters (1957) movie soundboard.

You can hear this line at 00:30:29.894 in the DVD version of the movie.

Quote context

[...]

- I suppose you can tell us what tore up this room last night.

- No, I cannot tell you that. But I can tell you this.

- Everything that has happened from the death of the first sailor to the destruction of our radio must be somehow related.

- They are too far from the normal scheme of things to be separate accidents.

- If there is a single cause, then that cause is outside of nature as we know it.

- Yes, that is why I insisted on caution entering the caves.

- We are unquestionably on the brink of a great discovery. It is not likely that that discovery will be of a pleasant nature.

- That is the sum of my knowledge. If you need more, I suggest you ask Dr. McLane when next his voice calls in the night.

- Now, let us again seek Dr. Carson.

- I don't understand this. We've covered every exit in the base of the pit. Wounded as he was, he couldn't have crawled this far.

- Yet, still no sign of him.

- Nor will be, eh, Karl?

[...]