Dimension subspace

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Matrix $B= \begin{bmatrix} 0 & 3 & 6\\ 1 & 2 & 5 \end{bmatrix}$. Find $Y^*$ s.t.

$$\underset{{x \in Y^*,\|x\|_2 =1}} \min \|Bx\|_2=\underset{{\dim Y=2, x \in Y},} \max \underset{{\|x\|_2 =1}} \min \|Bx\|_2.$$ I appreciate some solutions or relevant notes.