A bench of justices S C Dharmadhikari and Bharati Dangre also asked the state government and the Mumbai Metro Rail Corporation (MMRC) to tell the court about the extent of ecological damage that the construction work for the proposed car shed is likely to cause.
It directed the state to file its reply by March 1.
The court was hearing a public interest litigation challenging a notification of the state government through which, in August 2017, around 25 hectares of land in Aarey colony was allotted for the construction of a car shed and allied services for the Mumbai Metro III (Colaba-Bandra-SEEPZ) project.
The construction for the same was likely to destroy extensive green cover and cause much ecological damage, the petitioners said.
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The MMRC, however, filed an affidavit in the high court today stating that it had followed due procedure in taking over the land concerned.
It also told the court that it would ensure that the damage caused to the green cover because of the proposed construction work was restricted to the minimum.
"What is your standard for minimum and maximum damage? What kind of construction work will be undertaken for the car shed? You will need to construct a parking shed, an office block, and some related infrastructure. What kind of ecological damage will all this cause?" it said.
When the bench asked the state government for its opinion, it submitted that its stand was similar to that taken by the MMRC in its affidavit.
This prompted the bench to ask, on a lighter note, whether "the state was running the Mumbai Metro, or the Metro was running the state government?"
"Also, for how long will this construction work go on? Today, it takes at least two hours to reach anywhere in Mumbai courtesy you (MMRC)," the bench said, referring to the traffic woes due to the ongoing Metro III construction work.
"Everything is dug up. We wonder whether at the end of all this, will any bit of Mumbai be left, or will we be left only with Mumbai Metro," the bench said.
The petitioners, some NGOs and activists, had alleged that a suitable alternative plot was available in Kanjurmarg.
The state's counsel A Y Patki, however, told the bench that the Kanjurmarg land was under litigation and pursuing the same would significantly delay the Metro project.
He said that in 2016, the state had appointed a committee to look into suitable options for the car shed.
This committee had considered the Kanjurmarg plot, too, and after due consideration of all factors, recommended that the plot in Aarey be used for the same.
"While initially some commercial work had also been planned at the car shed plot, we decided to use the land only for the car shed and allied services in order to minimise ecological damage," Patki told the high court.