The reported depth was 4,475 fathoms (8184 meters) based on two separate soundings. However, the Board of Estimate did approve $150,000 for preliminary borings and soundings. Thus the positions calculated are a mixture of dead reckoning, soundings, and observations of latitude. These were the first known upper atmosphere rocket soundings in the Antarctic area. Incredulous, Magellan led the fleet through the western waters again, taking frequent soundings. Since then, except for targeted soundings and excavations, work was confined to the excavated areas. The greatest depth ever obtained by soundings is . At daybreak, preceded by a small boat taking soundings, Maynard's two sloops entered the channel. Instead, a hand line was the only method "Edmund Fitzgerald" had to take depth soundings. Examples are the barograph, wind, or thermograph traces, and early upper air soundings. A chart of this soundings will be made. Subsequent soundings failed to substantiate this theory. Burnham gives the position of the soundings as . Initial soundings were carried out by John Garstang in 1926. Whole choruses of such horn soundings were heard.