At 8 A.M. the trawl was once more on board, the frames being bent and twisted and the net badly torn. On sounding, the depth was found to be only six hundred and thirty-six fathoms, so that we had evidently put over the trawl on to the edge of a steep rise and then drifted across it.
In view of our position—only thirty miles from Macquarie Island—this accident might have been expected. But opportunities of trawling had been so few that risks had to be taken when the weather quieted down for a few hours. Our only consolation on this occasion was that we recovered the gear.
The following evening, at 7.30, the anchor was dropped in North-East Bay, Macquarie Island, and we were immediately boarded by our land party who were all well. They had become very clever boatmen during their stay, using a small dinghy to make coastal journeys.
On November 24 we left the anchorage at 9 A.M. and spent the day in its vicinity. More than one hundred soundings were taken, which Blake, the geological surveyor, was to plot on the chart of the island which he had almost completed.
Some idea of the steepness of the submarine mountain of which Macquarie Island forms the crest may be gathered from a sounding, taken ten and a half miles east of the island, which gave two thousand seven hundred and forty-five fathoms and no bottom. In other words, if the sea were to dry up, there would be a lofty mountain rising from the plain of the ocean's bed to a height of nearly eighteen thousand feet.
A great deal of work still required to be done off Macquarie Island, but, as the uneven and rocky nature of the bottom prevented dredging, I decided to sail on the 25th, continuing the voyage towards the Auckland Islands.
Several people had expressed belief in a submarine ridge connecting Macquarie Island with the Auckland group. Three soundings which we obtained on this voyage did not support the suggestion, ranging as they did from one thousand eight hundred and fifty-five to two thousand four hundred and thirty fathoms, eighty-five miles south-west of the Auckland group. We were the more glad to obtain these soundings, as, during the winter cruise, in the same waters, the weather had forced us to abandon the attempt.
On November 28 we took several soundings on the eastern side of the Auckland Islands, but did not prolong our stay as we wished to investigate the ridge south of Tasmania—the Mill Rise. The course was therefore directed westward with a view to outlining the eastern edge of this submarine elevation.
The first sounding to indicate that we were once more approaching the Mill Rise was in one thousand and seventy-six fathoms. Continuing west we secured the next record in one thousand three hundred fathoms, limiting the southern extremity of the ridge which extends northward for nearly one hundred miles. From this sounding the water shoaled quickly as we steered north. Thus, on the same day, we were in eight hundred and thirty-five fathoms at noon, in seven hundred and thirty-five fathoms at 3.40 P.M. and in seven hundred and ten fathoms at 7.30 P.M. After the last sounding we lowered the rock-gripper. On the first trial, however, it failed to shut and, on the second, only a little fine sand was recovered. As it was blowing hard most of the time, we were very fortunate in being able to do this piece of work.
An inspection of the chart reveals the fact that the main direction of the shallowest water is in a north-west and south-east direction, but the number of soundings obtained was too small to give more than a general outline. Later, we were able to add to these on the voyage southward to relieve the Antarctic Bases.