## 4 Results
### Winch
\begin{table}
\begin{tabular}{l c c c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Measured Area**} & \multicolumn{10}{c}{**Composition (wt\%)**} \\ \cline{2-13}  & **Fe** & **Si** & **O** & **P** & **S** & **Mn** & **Ti** & **Cu** & **Cr** & **Al** & **Ca** & **Mg** & **V** \\ \hline Winch drum, grey cast iron (Figure 4a, area 1 of ferrite matrix with graphite flakes, scanned area 200 \(\upmu\)m \(\times\) 200 \(\upmu\)m)-carbon peaks omitted & 95.2 & 2.7 & - & 0.6 & 0.1 & 1.1 & 0.1 & 0.2 & - & - & - & - & - & - \\ \hline Winch drum, grey cast iron (Figure 4a, area 2 of ferrite matrix with graphite flakes, scanned area 200 \(\upmu\)m \(\times\) 200 \(\upmu\)m)-carbon peaks omitted & 95.0 & 2.6 & - & 1.0 & 0.1 & 1.1 & 0.2 & - & - & - & - & - & - & - \\ \hline Winch drum, area of MnS (Figure 4c, area 1, and Supplementary Material Figure S6, scanned area 10 \(\upmu\)m \(\times\) 10 \(\upmu\)m) & 2.9 & - & 0.3 & 0.5 & 36.9 & 59.2 & 0.2 & - & - & - & - & - & - & - \\ \hline Winch drum, grey cast iron (Figure 4d, area 1 of ferrite matrix, scanned area 20 \(\upmu\)m \(\times\) 20 \(\upmu\)m) & 96.0 & 2.8 & - & 0.2 & - & 0.9 & - & 0.1 & - & - & - & - & - & - \\ \hline Winch drum, area of Fe\({}_{3}\)P (Figure 4d, area 2, scanned area 20 \(\upmu\)m \(\times\) 20 \(\upmu\)m) & 83.7 & 0.3 & - & 13.8 & - & 2.0 & 0.1 & - & 0.1 & - & - & - & - & - \\ \hline Winch shaft, wrought iron, iron matrix (Figure 6e, scanned area 1200 \(\upmu\)m \(\times\) 800 \(\upmu\)m) & 99.5 & 0.1 & - & 0.3 & 0.1 & - & - & - & - & - & - & - & - \\ \hline Winch shaft, wrought iron, iron matrix (Figure 6f, area 1, scanned area 40 \(\upmu\)m \(\times\) 40 \(\upmu\)m) & 99.3 & 0.2 & - & 0.4 & 0.1 & - & - & - & - & - & - & - & - \\ \hline Winch shaft, wrought iron, iron matrix (Figure 6f, area 2, scanned area 40 \(\upmu\)m \(\times\) 40 \(\upmu\)m) & 99.8 & - & - & 0.2 & - & - & - & - & - & - & - & - & - \\ \hline Heart-shaped shackle link, wrought iron (scanned area 800 \(\upmu\)m \(\times\) 500 \(\upmu\)m) & 96.3 & 0.6 & 2.3 & 0.6 & 0.2 & - & - & - & - & - & - & - & - \\ \hline Heart-shaped shackle link, area rich in inclusions (Supplementary Material Figure S12a, scanned area 30 \(\upmu\)m \(\times\) 30 \(\upmu\)m) & 49.6 & 6.2 & 34.8 & 3.7 & 2.0 & 2.1 & 0.2 & - & - & 0.7 & 0.5 & 0.2 & - & - & - \\ \hline Heart-shaped shackle link, in typical glassy inclusion (scanned area 20 \(\upmu\)m \(\times\) 20 \(\upmu\)m) & 47.0 & 8.9 & 37.0 & 1.0 & 1.7 & 2.7 & 0.2 & - & 0.1 & 0.6 & 0.5 & 0.1 & 0.2 \\ \hline Heart-shaped shackle link, in typical two-phase inclusion (Figure 8d, Supplementary Material Figure S14b, scanned area 30 \(\upmu\)m \(\times\) 30 \(\upmu\)m) & 66.0 & 2.2 & 26.8 & 2.9 & 0.8 & 1.0 & - & - & - & - & 0.1 & - & 0.2 & - & - & - \\ \hline Heart-shaped shackle link, typical ferrite grain (Supplementary Material Figure S12b, scanned area 40 \(\upmu\)m \(\times\) 40 \(\upmu\)m) & 99.2 & 0.5 & 0.2 & - & - & 0.1 & - & - & - & - & - & - & - & - & - \\ \hline Heart-shaped shackle, wrought iron (scanned area 1200 \(\upmu\)m \(\times\) 900 \(\upmu\)m) & 97.0 & 0.5 & 1.8 & 0.4 & 0.1 & 0.2 & - & - & - & - & - & - & - & - & - \\ \hline Heart-shaped shackle, in typical glassy inclusion No. 1 (Figure 9c, scanned area 20 \(\upmu\)m \(\times\) 20 \(\upmu\)m) & 51.2 & 10.3 & 33.8 & 0.4 & - & 3.4 & - & - & - & - & - & 0.2 & 0.2 & 0.5 & - & - \\ \hline Heart-shaped shackle, in typical glassy inclusion No. 2 (Figure 9c, scanned area 10 \(\upmu\)m \(\times\) 10 \(\upmu\)m) & 54.3 & 10.3 & 31.0 & 0.9 & - & 2.8 & - & - & - & - & 0.2 & - & 0.4 & 0.1 \\ \hline Heart-shaped shackle, in typical two-phase inclusion No. 3 (Figure 9c, scanned area 20 \(\upmu\)m \(\times\) 20 \(\upmu\)m) & 74.1 & 0.4 & 24.2 & 0.3 & 0.6 & 0.4 & - & - & - & - & - & - & - & - & - \\ \hline Heart-shaped shackle, typical ferrite matrix (Figure 9c, area 4, scanned area 20 \(\upmu\)m \(\times\) 20 \(\upmu\)m) & 99.7 & 0.1 & - & 0.2 & - & - & - & - & - & - & - & - & - & - \\ \hline Futtock plate, wrought iron (Supplementary Material Figure S21a, scanned area 60 \(\upmu\)m \(\times\) 400 \(\upmu\)m) & 96.2 & 0.4 & 2.8 & 0.2 & 0.1 & 0.3 & - & - & - & - & - & - & - & - \\ \hline Futtock plate, wrought iron (Supplementary Material Figure S21b, scanned area 160 \(\upmu\)m \(\times\) 120 \(\upmu\)m) & 97.4 & 0.4 & 1.7 & 0.2 & 0.1 & 0.2 & - & - & - & - & - & - & - & - \\ \hline Futtock plate, wrought iron (scanned area 120 \(\upmu\)m \(\times\) 80 \(\upmu\)m) & 99.5 & - & - & - & 0.2 & - & 0.2 & - & 0.1 & - & - & - & - & - & - & - \\ \hline Deadeye strap, wrought iron (Supplementary Material Figure S21a, scanned area 100 \(\upmu\)m \(\times\) 800 \(\upmu\)m) & 96.8 & 0.5 & 1.7 & 0.6 & 0.1 & 0.3 & - & - & - & - & - & - & - & - & - \\ \hline \hline \end{tabular}
\end{table}