The article says the state company is considering a capital-market bond to fund tunneling and equipment before betterment levies and fees arrive. Finance players warn the risk profile is high because of long timelines and uncertain collateral, so options for government backing or partial guarantees are being weighed. Bizportal notes NTA is talking with institutional investors about pricing, coupons, and matching durations to the project schedule. The decision will shape overall financing costs and the pace of construction.