There were several tunnel alternatives to connect A8 and A9 roads. One of the proposed tunnels was 2.5 kilometres long. Province decides that because of `legal and technical reasons' the tunnel options are not doable.

https://www.noordhollandsdagblad.nl/cnt/dmf20200529_27305591/verbindingsweg-a8-a9-kan-niet-per-tunnel-onder-stelling-van-amsterdam-door