The Lightning sailed to begin operations at Cape Frio on the 24th of January, 1831, with a Brazilian launch in tow, "and La Seine, French frigate, in company, going to visit the place as a matter of curiosity." At the scene of the wreck were found the sloop of war Algerine, a schooner as tender, and a complement from the Warspite, which were engaged in saving such stores and spars as had drifted ashore. The theater of Captain Dickinson's ambition as a treasure-seeker was hostile and forbidding, a coast on which it seemed impossible to tarry except in the most favorable weather. As he describes it, "the island of Cape Frio is about three miles long and one in breadth, is the southeastern extremity of Brazil, and separated from the mainland by a narrow strait or gut about four hundred feet broad, having very deep water in it, and through which, the land on each side being very high, the wind constantly rushes in heavy gusts, and a rapid current runs. This island is entirely mountainous, and nearly covered with an almost impenetrable forest, and the whole coast on the sea side of it is formed by precipitous cliffs, washed by very deep water close to the shore; and on the harbor side, with the exception of a sandy bay, is very steep and rugged."
The little notch in the seaward cliffs, into which the frigate had been driven, was named Thetis Cove by Captain Dickinson who explored it vainly for traces of the wrecked hull. Either she had been washed out into deep water, or had entirely broken up. Two months had passed since the disaster, and the only way of trying to find the remains of the vessel was by means of sounding with a hand-lead until the diving bell could be rigged. The depth of water ranged from thirty-six to seventy feet at the base of the cliffs.
This cove was an extraordinarily difficult place to work in, there being no beach and the ramparts of rock towering straight from the water to heights of from one hundred to two hundred feet. Said Captain Dickinson:
"On viewing this terrific place, with the knowledge that at the time of the shipwreck the wind was from the southward, I was struck with astonishment, and it appeared quite a mystery that so great a number of lives could have been saved; and indeed it will never cease to be so, for that part at which the crew landed is so difficult of access, that (even in fine weather), after being placed by a boat on the rock at the base, it required considerable strength and agility, with the assistance of a man-rope, to climb the precipitous face of the cliff; and I am certain that in the hour of extreme peril, when excess of exertion was called forth, there must have been a most extraordinary display of it by a few for the benefit of the whole."
Now, this make-shift diving bell of his had to be suspended from something in order to be raised and lowered, but neither his own ship, the Lightning, nor any of the other vessels of the salvage fleet could be anchored in the cove to serve the purpose because of the grave danger of being caught on a lee shore. At first Captain Dickinson planned to stretch a cable between the cliffs on either side of the cove but this was found to be impracticable. Thereupon he proceeded to fashion a huge derrick from which the diving bell should hang like a sinker at the end of a fishing-rod. There was no timber on the cape that was fit to be worked up by the ship carpenters, but these worthies, Mr. Batt of the Warspite and Mr. Daniel Jones of the Lightning, were not to be daunted by such a trifling matter as this. If a derrick was needed, they were the men to make it out of nothing.
What they did was to assemble the broken masts and spars that had drifted ashore from the wreck of the Thetis and patch them together into one immense derrick arm which with its gear weighed as much as forty tons. It was a masterpiece of ingenuity and seamanship of the old-fashioned school, such as can no longer be found in navies. This breed of handy man at sea belonged with the vanished age of masts and canvas and "wooden walls."
"Our encampment and the adjacent parts of the island now presented a bustling, and, I flattered myself, a rather interesting scene," wrote the commander. "There were parties of carpenters building the derrick, making, carrying to the selected situations, and placing the securities for supporting and working it. Riggers were preparing the gear for it, sawyers cutting wood for various purposes, rope-makers making lashing and seizing stuff from the pieces of cable crept[[2]] up from the bottom, and two sets of blacksmiths at their forges; those of the Warspite making hoops, bolts, and nails, from various articles which had been crept up; and those of the Lightning reducing the large diving bell and constructing a smaller one; five gangs of excavators leveling platforms on the heights above the cove, cutting roads to lead to them, and fixing bolts in numerous parts of the faces of the cliffs; some were employed in felling trees and cutting grass for the huts while others were building and thatching them; water carriers were passing to and from the pool with breakers of water; and the officers were attending to the different parties assigned to them for their immediate guidance."
When ready to be placed in position, this derrick, built of odds and ends, was an enormous spar one hundred and fifty-eight feet long. To support it over the water, elaborate devices had to be rigged from the cliff overhead, and the whole story of this achievement, as related by Captain Dickinson, reads like such a masterful, almost titanic battle against odds that it seems worth while quoting at some length:
"We had by this time taken off thirteen feet of the peak of the northeast cliff, and thereby made a platform of eighty feet by sixty. On this was placed the Lightning's capstan and four crabs[[3]] formed of the heels of the Thetis's topmasts, the Lightning's bower and stream anchors, and the store anchor, to which was shackled the chain splicing-tails and several lengths of the Thetis's chain stream cable which we had recovered, extending several fathoms over the cliff to attach the standing parts of the topping-lifts and guy-topping-lifts to, and preserve them from chafing against the rocks. There were also eight large bollards[[4]] placed in proper positions for other securities. Four other platforms, each large enough for working a crab, were made at appropriate parts for using the guys and guy-topping lifts. The roads and paths had been cut, extending from our encampment to those platforms, and from the one to the other of them together amounted to the length of nearly a mile and a half. The zig-zag path down the cliff was finished, and at those parts of the main cliff which were inaccessible in this manner, rope-ladders were substituted, and thus a communication was formed with the cove at the point where the derrick was to be stepped.
"All this being done, the large hawsers were rove through the blocks, their purchases lashed to them, and partially overhauled over the cliffs. The getting the before-mentioned heavy articles up was most distressingly laborious, for they were obliged to be carried a greater part of the distance where the surface was covered with a deep loose sand, and to this cause may be mainly attributed a complaint of the heart which subsequently attacked several of the people.