Patrols of Gold Coast waterways and checks on boaties berthing at Southport are being stepped up to stop the leak in people flouting lockdown and border arrival restrictions and slinking in by sea.

Maritime Safety Queensland (MSQ) general manager Angus Mitchell said the group who arrived on the 34-metre superyacht at Southport before heading up the motorway to watch the Wallabies’ Test against France at Suncorp Stadium on Wednesday were among a host of border crossers trying to breach Queensland’s entry restrictions by water.

“Several boaties have been intercepted and fined, placed in hotel quarantine or turned back in recent weeks in an expensive reminder of their responsibilities,” Mitchell said.

Gold Coast police Acting Chief Superintendent Rhys Wildman said two other vessels had also attempted to arrive at Southport without completing appropriate border passes.

“Action has been taken against those two vessels as well,” Wildman said.

Wildman said MSQ and water police were monitoring the Gold Coast seaway and the berths at Southport.

“By constantly monitoring traffic that comes in through this way we aim to pick up any of these people who do try and flout the laws,” Wildman said.

“We will be maintaining a heavy presence on the waterways entrances to Queensland, as well as by road and by air.”

Wildman said the four men arrived on the superyacht Dreamtime, that costs around $70,000 a week to charter, on 7 July.

They were found to have arrived from Sydney’s northern beaches, a declared hotspot, after police became suspicious of the crew and obtained CCTV footage from their origin point in Sydney.

The four people, 44-year-old superyacht owner, his 59-year-old personal assistant, the superyacht’s 54-year-old captain and a 55-year-old engineer, have each been fined $4000 and are in hotel quarantine.

“Once they berthed at Southport they did travel to Brisbane supposedly to see a Wallabies test match,” Wildman said.

“It is extremely disappointing, but once again this is four individuals out of 600,000 people on the Gold Coast. These people are visitors, and it only takes one to put us all at risk.

“And this is one of the reasons that we are applying this border approach not only to those coming in by road, but to those coming in by air to the Gold Coast and also the waterways.”

With another rugby union international on Saturday in Brisbane, the third rugby league State of Origin game tomorrow on the Gold Coast, and the remainder of the NRL season being relocated to Queensland, Premier Annastacia Palaszczuk has again faced questions about the risks.

Her government has been quick to host any new sporting events, to boost Queensland’s tourism and hospitality sector, and the Premier today questioned the alternative.

“What’s going to happen, no competition? I don’t think the public would like that,” she said.

Palaszczuk denied the events sent the wrong message or demonstrated the government was treating people differently.

“There’s no special rules for people, we are trying to treat people in the best way we possibly can,” Palaszczuk said.

“And have a look at Queensland – so far Queensland’s going okay, alright, but anything can change any day. And if you don’t think that’s stressful come and take a walk in my shoes.”