After a successful SG50, we cannot afford to have future generations blaming us for damaging our catchment area ("Call for 'zero impact' on nature reserve"; Feb 14).

Any soil testing and construction should be confined to existing roadways and not on trails and clearings.

It is more difficult to control and monitor - not to mention more expensive to construct - work under the catchment area than on roads for motor vehicles.

Four minutes of travelling time saved is nothing to crow about when permanent damage to the ecosystem of our largest nature reserve can be expected.

The frequent MRT breakdowns are a bigger issue for commuters than four minutes of travelling time saved.

As there is an alternative route the new MRT line can take, we should not risk damaging our nature reserve, however small that risk may be.

Teo Kheng Seng