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documentclass[tikz,margin=3mm]{standalone}

usepackage{siunitx}

usetikzlibrary{patterns}

begin{document}

begin{tikzpicture}

draw (0,4.5)--(0,0)--(2,0)--(2,4.5);

draw (0,0) rectangle (2,4);

foreach i in {0.2,0.6,...,3.9}

    draw[ultra thin,cyan,dash pattern=on 4pt off 4pt] (0,i)--(2,i);

foreach i in {0.4,0.8,...,3.9}

    draw[ultra thin,cyan,dash pattern=on 4pt off 4pt,dash phase=4pt] (0,i)--(2,i);

draw (-1,0)--(3,0);

fill[pattern=north east lines] (-1,0) rectangle (3,-.2);

% Do something with the diver at (1,1)

begin{footnotesize}

draw[very thin] (1.5,3)--(2.5,3.1) node[right,align=left] {

    sea water\

    (density 1020 si{kg.m^{-3}}\

    or 1.02 si{g.cm^{-3}})

};

draw[very thin] (1,1)--(2.5,1.2) node[right] {diver};

end{footnotesize}

end{tikzpicture}

end{document}

documentclass[tikz,margin=3mm]{standalone}

usepackage{siunitx}

usetikzlibrary{patterns}

begin{document}

begin{tikzpicture}

draw (0,4.5)--(0,0)--(2,0)--(2,4.5);

draw (0,0) rectangle (2,4);

foreach i in {0.2,0.6,...,3.9}

    draw[ultra thin,cyan,dash pattern=on 4pt off 4pt] (0,i)--(2,i);

foreach i in {0.4,0.8,...,3.9}

    draw[ultra thin,cyan,dash pattern=on 4pt off 4pt,dash phase=4pt] (0,i)--(2,i);

draw (-1,0)--(3,0);

fill[pattern=north east lines] (-1,0) rectangle (3,-.2);

% Do something with the diver at (1,1)

begin{footnotesize}

draw[very thin] (1.5,3)--(2.5,3.1) node[right,align=left] {

    sea water\

    (density 1020 si{kg.m^{-3}}\

    or 1.02 si{g.cm^{-3}})

};

draw[very thin] (1,1)--(2.5,1.2) node[right] {diver};

end{footnotesize}

end{tikzpicture}

end{document}

documentclass[tikz,margin=3mm]{standalone}

usepackage{siunitx}

usetikzlibrary{patterns}

begin{document}

begin{tikzpicture}

draw (0,4.5)--(0,0)--(2,0)--(2,4.5);

draw (0,0) rectangle (2,4);

foreach i in {0.2,0.6,...,3.9}

    draw[ultra thin,cyan,dash pattern=on 4pt off 4pt] (0,i)--(2,i);

foreach i in {0.4,0.8,...,3.9}

    draw[ultra thin,cyan,dash pattern=on 4pt off 4pt,dash phase=4pt] (0,i)--(2,i);

draw (-1,0)--(3,0);

fill[pattern=north east lines] (-1,0) rectangle (3,-.2);

% Do something with the diver at (1,1)

begin{footnotesize}

draw[very thin] (1.5,3)--(2.5,3.1) node[right,align=left] {

    sea water\

    (density 1020 si{kg.m^{-3}}\

    or 1.02 si{g.cm^{-3}})

};

draw[very thin] (1,1)--(2.5,1.2) node[right] {diver};

end{footnotesize}

end{tikzpicture}

end{document}

documentclass[tikz,margin=3mm]{standalone}

usepackage{siunitx}

usetikzlibrary{patterns}

begin{document}

begin{tikzpicture}

draw (0,4.5)--(0,0)--(2,0)--(2,4.5);

draw (0,0) rectangle (2,4);

foreach i in {0.2,0.6,...,3.9}

    draw[ultra thin,cyan,dash pattern=on 4pt off 4pt] (0,i)--(2,i);

foreach i in {0.4,0.8,...,3.9}

    draw[ultra thin,cyan,dash pattern=on 4pt off 4pt,dash phase=4pt] (0,i)--(2,i);

draw (-1,0)--(3,0);

fill[pattern=north east lines] (-1,0) rectangle (3,-.2);

% Do something with the diver at (1,1)

begin{footnotesize}

draw[very thin] (1.5,3)--(2.5,3.1) node[right,align=left] {

    sea water\

    (density 1020 si{kg.m^{-3}}\

    or 1.02 si{g.cm^{-3}})

};

draw[very thin] (1,1)--(2.5,1.2) node[right] {diver};

end{footnotesize}

end{tikzpicture}

end{document}

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