Conversation so far:
What was the disaster for William Thomson, 1st Baron Kelvin?
Thomson sailed on the cable-laying expedition of the SS Great Eastern but cable was lost after 1,200 miles (1,900 km) had been laid and the project was abandoned.
In what year did the calbe-laying expedition of the SS Great Eastern with William Thomson, 1st Baron Kelvin being abandoned happen?
1865
What happened after the cable-laying expedition of the SS Great Eastern with William Thomson, 1st Baron Kelvin was abandoned?
A further attempt in 1866 laid a new cable in two weeks , and the recover and complete the 1865 cable.

Question: What was the triumph?
Self-contained rewrite: What was the triumph for William Thomson, 1st Baron Kelvin after new cable was laid in 1866 and the recovery and completition of the 1865 cable?