"Watch! Out there!" exclaimed the general, pointing into the night. Rainsford's eyes saw only blackness, and then, as the general pressed a...
... button far out to sea, Rainsford saw the flash of lights. The general chuckled. "They indicate a channel," he said, "where there's none: giant rocks with razor edges crouch like a sea monster with wide-open jaws. They can crush a ship as easily as I crush this nut."
I assume that you want an explanation of this passage from the short story, "The Most Dangerous Game." This is one of General Zaroff's special ways of luring his human game to the island. He has installed what appears to be legitimate signal lights to mark the safety of the channel. In truth, the channel is not safe; it is a false channel--"giant rocks with razor edges" cover the area. Ship captains cannot see the rocks, and they assume that the lights are marking a safe passage. The lights may be of little use during the day, but they can prove to be successful to General Zaroff's desire of wrecking as many ships as possible near his island at night. He then captures the survivors and uses them as his game.